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NCERT Solutions for Class 10 Science Chapter 10 Light Reflection and Refraction -If you are in search of NCERT Class 10 Science Chapter 10 Exercise Solutions- Light Reflection and Refraction, look no further. This article provides comprehensive step-by-step solutions that will assist you in completing exercise questions and assignments. Light class 10 ncert solutions reflection and Refraction, being an essential and straightforward chapter in Class 10, often contains 3-4 questions in board examinations.
In addition to NCERT Solutions, experts at Careers360 have compiled a valuable collection of chapter-wise important formulas. These formulas serve as a valuable resource for students, aiding in revision during exams and enabling them to solve questions from the NCERT textbook or any other reference book.
By reading this article, you will gain access to easy-to-understand, step-by-step solutions for each question in the chapter reflection of light class 10. Alternatively, you can download the class 10 science chapter 10 question answer and important formulas in the form of a PDF, allowing you to access them offline at any time and from anywhere, absolutely free of cost.
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To solve all the questions or understand each concept in detail of any chapter, it is essential to know the important formulas associated with that chapter. The subject matter experts at Careers360 have compiled all the important formulas of this light class 10 ncert solutions, which are provided below. Additionally, you can find the chapter-wise important formulas of Class 10 Science by clicking on the link given below and downloading the PDF for free.
Law of Reflection:
Angle of incidence (θᵢ) = Angle of reflection (θᵣ)
Snell's Law:
n₁sin(θ₁) = n₂sin(θ₂)
Where, n₁ and n₂ are the refractive indices of the initial and final media, respectively, and θ₁ and θ₂ are the corresponding angles of incidence and refraction.
Mirror formula:
1/v+1/u=1f
1/v-1/u=1/f
Magnification by a spherical mirror:
m= hi/ho=-v/u
Where:
hi = Height of image and ho=Height of object
By having access to these formulas of ncert class 10 science chapter 10 exercise solutions, you can enhance your understanding of the chapter and confidently tackle various questions and problems. These formulas serve as valuable tools for revision and assist you in applying the concepts effectively.
If you're aiming to score well in ncert class 10 science chapter 10 exercise solutions, focusing on these important topics of light reflection and refraction will greatly assist you. By dedicating your study efforts to these specific areas, you can maximize your understanding and performance, ultimately increasing your chances of achieving good marks.
Additionally, pay attention to these important concepts of class 10 science chapter 10 question answer:
By reading these concepts of class 10th science chapter 10 question answer students can revise the chapter in less time and score good marks in exams.
This chapter has been renumbered as Chapter 9 in accordance with the CBSE Syllabus 2023–24.
NCERT Solutions For Class 10 science ch 10 NCERT Solutions Light Reflection and Refraction
Q.1 Define the principal focus of a concave mirror.
Answer:
It is the point on the principal axis where a beam of light parallel to the principal axis after reflection actually meets.
F represents the focal length
Q.2 The radius of curvature of a spherical mirror is 20 cm. What is its focal length?
Answer:
So,
Hence the Focal length of the spherical mirror is 10 cm.
Q.3 Name a mirror that can give an erect and enlarged image of an object.
Answer:
Convex mirror usually gives a virtual and erect image.
The concave mirror gives a virtual and enlarged image only when the object is between pole and focus.
Q.4 Why do we prefer a convex mirror as a rear-view mirror in vehicles?
Answer :
Convex mirrors are preferred as a rearview mirror in vehicles as:
i) It forms an erect (Rigidly upright or straight.) image of an object hence object becomes easily identified.
ii) It forms a diminished image of the object thus increases the field of vision.
iii) An object that is far away from us is seen closer which helps us to take early decisions while driving.
CBSE Class 10 Science ch 10 Question Answer Light
Q.1 Find the focal length of a convex mirror whose radius of curvature is 32 cm .
Answer:
As we know for the convex mirror,
Radius (R) = Focus (f) X 2
So,
putting the given values,
Hence Focus of the convex mirror is 15 cm.
Answer:
Here Given Magnification:
m= -3 (real image)
The object distance :
u =-10cm
Now As we know,
Hence,
The image is 30 cm in front of the mirror.
NCERT Textbook Solutions for Light Class 10 Science Chapter
Answer:
As we know that when the light goes from rare medium to denser medium the light bends towards the normal. So when the light goes from air to water it will bend toward the normal.
Answer:
As we know, from the definition of the refractive index that
Refractive Index :
Where = Velocity of light in the medium and
= Speed of light in vacuum
So putting those given values we get,
Hence the speed of the light in the glass is .
Material Medium | Refractive Index | Material Medium | Refractive Index |
Air Ice water Alcohol Kerosene Fused Quartz Turpentine oil Benzene Crown Glass | 1.0003 1.31 1.33 1.36 1.44 1.46 1.47 1.50 1.52 | Canada Balsam Rock Salt Carbon-Disulphide Dense Flint Glass Ruby Sapphire Diamond | 1.53 1.54 1.63 1.65 1.71 1.77 2.42 |
Answer :
As we know optical density is the tendency to hold(absorb) the light. So,
more refractive index = more absorbing power = more optical density.
It can be observed from table 10.3 that diamond and air respectively have the highest and lowest refractive index. Therefore, diamond has the highest optical density and air has the lowest optical density.
Material Medium | Refractive Index | Material Medium | Refractive Index |
Air Ice water Alcohol Kerosene Fused Quartz Turpentine oil Benzene Crown Glass | 1.0003 1.31 1.33 1.36 1.44 1.46 1.47 1.50 1.52 | Canada Balsam Rock Salt Carbon-Disulphide Dense Flint Glass Ruby Sapphire Diamond | 1.53 1.54 1.63 1.65 1.71 1.77 2.42 |
Answer:
As we can see from the table:
Refractive index of kerosene = 1.44
Refractive index of terbutaline = 1.47
Refractive index of water = 1.33
We know from the definition of refractive index, that the speed of light is higher in a medium with the lower refractive index.
So, the light travels fastest in water relative to kerosene and turpentine.
speed of light---> water > kerosene > turpentine
Q.5 The refractive index of diamond is 2.42. What is the meaning of this statement?
Answer:
Refractive Index shows the comparison of light speeds in two mediums. Light may travel from rarer to denser medium or from denser to rarer medium. When we say the refractive index of diamond is 2.42, it means light is traveling from rarer to a denser medium, and the speed of light in the air (vacuum) is 2.42 times the speed of light in a diamond. On the other hand, if the light travels from denser to rarer medium, that is, from diamond to air the refractive index will be the reciprocal of 2.42.
Q.1 Define 1 dioptre of power of a lens.
Answer:
A lens whose focal length is 1 metre is said to have the power of 1 dioptre.
Answer:
Since the image formed by the lens is real and inverted it is formed on the side opposite to the one where the object is placed.
Image position v = 50 cm
Let the object position be u.
Since image formed is inverted and the size image is equal to the size of the object, magnification (m) = -1.
The needle is placed 50 cm in front of the lens
Using lens formula we have
Power of the lens P is given by
The power of the lens P is 4 Dioptre.
Q.3 Find the power of a concave lens of focal length 2 m.
Answer:
The focal length of the lens is f = -2 m. (The focal length of a concave lens is negative)
Power of the lens P is given by
The Power of the lens is - 0.5 Dioptre.
Q1. Which one of the following materials cannot be used to make a lens?
(a) Water (b) Glass (c) Plastic (d) Clay
Answer:
Clay cannot be used to make a lens.
(d) is the correct answer.
(a) Between the principal focus and the centre of curvature
(b) At the centre of curvature
(c) Beyond the centre of curvature
(d) Between the pole of the mirror and its principal focus.
Answer:
The position of the object should be between the pole of the mirror and its principal focus.
(d) is the correct answer.
(a) At the principal focus of the lens
(b) At twice the focal length
(c) At infinity
(d) Between the optical centre of the lens and its principal focus.
Answer:
An object should be placed at twice the focal length in front of a convex lens to get a real image of the size of the object
(b) is the correct answer.
Q 4 . A spherical mirror and a thin spherical lens have each a focal length of –15 cm. The mirror and the lens are likely to be
(a) both concave.
(b) both convex.
(c) the mirror is concave and the lens is convex.
(d) the mirror is convex, but the lens is concave.
Answer:
The mirror and the lens are both concave.
(a) is the correct answer.
Q 5. No matter how far you stand from a mirror, your image appears erect. The mirror is likely to be
(a) only plane.
(b) only concave.
(c) only convex.
(d) either plane or convex.
Answer:
The mirror is likely to be either plane or convex.
(d) is the correct answer.
(a) A convex lens of focal length 50 cm.
(b) A concave lens of focal length 50 cm.
(c) A convex lens of focal length 5 cm.
(d) A concave lens of focal length 5 cm.
Answer:
I would prefer to use a convex lens of focal length 5 cm while reading small letters found in a dictionary because a convex lens gives magnified image if the object is in between focus and radius of curvature and the magnification will be high for shorter focal length
(c) is the correct answer.
Answer:
For the image to be erect it has to be virtual and therefore as per convention v has to be positive
v > 0
u < 0
f < 0
fu > 0
u - f > 0
u > f
Therefore the object must be placed between the pole and focus of the mirror.
i.e -15 cm < u < 0
The image formed would be virtual and larger than the object.
Q 8.(a) Name the type of mirror used in the following situations.
Support your answer with reason.
Answer:
A concave mirror is used for headlights of a car as they can produce parallel beams of high intensity which can travel through large distances if the source of light is placed at the focus of the mirror.
Q 8.b) Name the type of mirror used in the following situations.
Support your answer with reason.
Answer:
The convex mirror would be used as a side/rear-view mirror of a vehicle as the image produced will be erect, virtual and diminished. A convex mirror also has a larger field of view as compared to a plane mirror of the same size.
Q 8.c) Name the type of mirror used in the following situations.
Support your answer with reason.
Answer:
The concave mirror would be used in a solar furnace to concentrate the incident rays from the sun on a solar panel.
Answer:
The lens would produce a complete image. Only the brightness of the image would be diminished.
Verification by experiment:
Apparatus required: a convex lens, a screen, and a candlelight
procedure:
1. Place screen behind a lens placed vertically
2. Move the candle to obtain a clear full-length image of a candle on the screen
3. Cover half of the lens with the black paper without disturbing the position of the lens
4. Note the observations
Observation: Size of the image is the same but the brightness reduces
Answer:
Object distance u = -25 cm.
Focal length = 10 cm
Let image distance be v
The position of the image is 16.66 cm on the other side of the lens.
Object size O = 5 cm.
Let the image size be I
Magnification is m
The nature of the image is real and its size is -3.33 cm.
The formation of the image is shown in the following ray diagram
Answer:
Focal length, f = -15 cm
Image distance, v = -10 cm ( As in case of the concave lens image is formed on the same side as the object is placed)
Let the object distance be u.
As per the lens formula
The object is placed at a distance of 30 cm from the lens.
Answer:
Object distance, u = -10 cm
Focal length, f = 15 cm
Let the image distance be v
As per the mirror formula
The image formed is virtual, erect, diminished and is formed 6 cm behind of the mirror.
Q 13. The magnification produced by a plane mirror is +1. What does this mean?
Answer:
It means the image formed is virtual, erect and of the same size as the object.
Answer:
Radius of curvature, R = 30 cm
Focal length, f = R/2 = 15 cm
Object distance, u = -20 cm
Let the image distance be v
Since v is positive image is formed behind the mirror.
Object size = 5 cm
A virtual, erect and diminished image of size 2.14 cm would be formed 8.57 cm behind the mirror.
Answer:
Object distance, u = -27 cm
Focal length, f = -18 cm
Let the image distance be v
As per the mirror formula
The negative sign shows the image is formed in front of the mirror and is real.
Object size = 7 cm
A real, inverted and magnified image of size 14 cm is formed in front of the mirror.
Q 16. Find the focal length of a lens of power – 2.0 D. What type of lens is this?
Answer:
The lens is concave because it's focal length is negative and is equal to -50 cm.
Answer:
The less is convex because its focal length is positive and therefore is converging.
NCERT Solutions for Class 10 for other subjects
Apart from the important topics we mentioned above in this article, there are a total of 16 topics of class 10 science ch 10 ncert solutions which are listed below:
10.1 Reflection of Light
10.2 Spherical Mirrors
10.2.1 Image Formation by Spherical Mirrors
10.2.2 Representation of Images Formed by Spherical Mirrors Using ray Diagrams
10.2.3 Sign Convention for Reflection by Spherical Mirrors
10.2.4 Mirror Formula and Magnification
10.3 Reflection of Light
10.3.1 Reflection through a Rectangular Glass Slab
10.3.2 The Refractive Index
10.3.3 Reflection by Spherical Lenses
10.3.4 Image Formation by Lenses
10.3.5 Image Formation in Lenses using Ray Diagrams
10.3.6 Sign Convention for Spherical Lenses
10.3.7 Lenses Formula and Magnification
10.3.8 Power of a lens
Easy to understand: The class 10 science chapter 10 question answer are designed to be easy and thorough, allowing students to gain a deeper understanding of the solutions and concepts of light reflection and refraction.
Score well in board exams: By utilizing the light reflection and refraction class 10 exercise answers, students can enhance their understanding of the chapter light class 10 and improve their performance in the CBSE board exams. The ncert class 10 science chapter 10 exercise solutions provide clarity on important topics and offer effective strategies for solving questions.
Comprehensive exercise questions: The NCERT solutions of chapter 10 science class 10 provide answers to the exercise questions given in the textbook, ensuring that students have a clear understanding of the concepts. Additionally, there are additional exercise questions included, allowing students to practice and reinforce their knowledge.
Expert guidance: The NCERT solutions for reflection of light class 10 Science are prepared by subject matter experts. In case of any doubts or queries, students can directly reach out to the experts for clarification and guidance, ensuring a thorough understanding of the topics covered in the chapter.
Offline Benefits: Class 10 science ch 10 NCERT Solutions are available in the form of PDF, students can download them and use them offline.
Firstly, it is essential to know the complete NCERT syllabus and clear all your concepts related to the given chapter.
Afterwards, practice the class 10th science chapter 10 question answer on your own. If you find it difficult to solve, then take help from the Light Reflection And Refraction Class 10 Science solutions.
Practice from previous year question papers or sample question papers to have a look at what type of questions were asked previously.
Also, Check NCERT Books and NCERT Syllabus here:
NCERT Solutions for Class 10 Science- Chapter Wise
Chapter No. | Chapter Name |
Chapter 1 | Chemical Reactions and Equations |
Chapter 2 | Acids, Bases, and Salts |
Chapter 3 | Metals and Non-metals |
Chapter 4 | Carbon and Its Compounds |
Chapter 5 | Periodic Classification of Elements |
Chapter 6 | Life Processes |
Chapter 7 | Control and Coordination |
Chapter 8 | How do Organisms Reproduce? |
Chapter 9 | Heredity and Evolution |
Chapter 10 | Light Reflection and Refraction |
Chapter 11 | The Human Eye and The Colorful World |
Chapter 12 | Electricity |
Chapter 13 | Magnetic Effects of Electric Current |
Chapter 14 | Sources of Energy |
Chapter 15 | Our Environment |
Chapter 16 | Sustainable Management of Natural Resources |
NCERT Science Exemplar Solutions Class 10 - Chapter Wise
Chapter No. | Chapter Name |
Chapter 1 | |
Chapter 2 | |
Chapter 3 | |
Chapter 4 | |
Chapter 5 | |
Chapter 6 | |
Chapter 7 | |
Chapter 8 | |
Chapter 9 | |
Chapter 10 | |
Chapter 11 | |
Chapter 12 | |
Chapter 13 | |
Chapter 14 | |
Chapter 15 | |
Chapter 16 |
Centre of Curvature, Principal Axis, Principal Focus, Focal Length, Images Formed by Spherical Mirrors, Mirror formula & Magnification, Refractive index, Refraction & Laws of refraction, Lens Formula & Magnification, Power of a lens.
NCERT solutions class 10 Science chapter 10 pdf download button available. By downloading you can save the webpage to check solutions offline.
6-7 marks. All the formulas and raydiagrams of the chapter are important. To get more problems of Light Reflection and Refraction refer to CBSE previous year papers, NCERT book and NCERT exemplar for Class 10.
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The in-depth explanation for better understanding of concepts.
Aligned with the CBSE syllabus.
Authentic and precise for improving problem-solving skills.
Free PDF downloads for easy access by students.
Exam Date:01 January,2025 - 14 February,2025
Exam Date:01 January,2025 - 14 February,2025
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