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Have you ever seen how a straw rim in a glass of water seems bent? Or have you ever wondered how spectacle glasses are able to make you see clearly or why cars use curved rear-view mirrors? The awesome phenomena, the fascinating behaviour of light, especially its reflection and refraction, explain these everyday observations. The NCERT Exemplar Solutions Class 10 Science Chapter 10 deals with light and its basic properties of the way it travels through various media and with the surface, how it reacts, etc. The laws of reflection and refraction, image formation by mirrors and lenses and examples of real-life applications such as optical instruments and corrective lenses are some of the principles of importance that are introduced in the chapter.
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The Class 10 Science exemplar solutions of Chapter 10 provide coherent, step by step explanations making the students grasp the concept in an in-depth manner. These sets contain a diverse range of sample questions, including MCQs, short answer formats, long answers, and exceedingly long answer questions that make one fully prepared for taking board exams. As per the new CBSE Class 10 Science syllabus, these solutions are both conceptual and sound in developing sound problem solving abilities. The practice of these well-designed solutions will assist the students who wish to do well in Science in school assessments as well as the entrance exams in the future.
Question:1
Which of the following can make a parallel beam of light when light from a point source is incident on it?
(a) Concave mirror as well as convex lens
(b) Convex mirror as well as concave lens
(c) Two plane mirrors placed at 90° to each other
(d) Concave mirror as well as concave lens
Question:2
A 10 mm long awl pin is placed vertically in front of a concave mirror. A 5 mm long image of the awl pin is formed at 30 cm in front of the mirror. The focal length of this mirror is
(a) – 30 cm
(b) – 20 cm
(c) – 40 cm
(d) – 60 cm
Question:3
Under which of the following conditions a concave mirror can form an image larger than the actual object?
(a) When the object is kept at a distance equal to its radius of curvature
(b) When the object is kept at a distance less than its focal length
(c) When the object is placed between the focus and the centre of curvature
(d) When the object is kept at a distance greater than its radius of curvature
Question:4
Figure 10.1 shows a ray of light as it travels from medium A to medium B. The Refractive index of medium B relative to medium A is
(a) $\sqrt{3}/\sqrt{2}$
(b) $\sqrt{2}/\sqrt{3}$
(c) ${1}/\sqrt{2}$
(d) $\sqrt{2}$
Question:5
A light ray enters from medium A to medium B as shown in Figure 10.2. The refractive index of medium B relative to A will be
(a) greater than unity
(b) less than unity
(c) equal to unity
(d) zero
Question:6
Beams of light are incident through the holes A and B and emerge out of box through the holes C and D respectively as shown in the Figure10.3. Which of the following could be inside the box?
(a) A rectangular glass slab
(b) A convex lens
(c) A concave lens
(d) A prism?
Question:7
A beam of light is incident through the holes on side A and emerges out of the holes on the other side of the box as shown in figure. Which of the following could be inside the box?
(a) Concave lens
(b) Rectangular slab
(c) prism
(d) Convex lens
Question:8
Which of the following statements is true?
(a) A convex lens has 4 dioptre power having focal length 0.25 m.
(b) A convex lens has – 4 dioptre power having focal length 0.25 m.
(c) A concave lens has 4 dioptre power having focal length 0.25 m.
(d) A concave lens has – 4 dioptre power having focal length 0.25 m
Question:9
Magnification produced by a rear-view mirror fitted in vehicles.
(a) is less than one
(b) is more than one
(c) is equal to one
(d) can be more than or less than one depending upon the position of the object in front of it.
Question:10
Rays from sun converge at a point 15 cm in front of a concave mirror. Where should an object be placed so that size of its image is equal to the size of the object?
(a) 15 cm in front of the mirror
(b) 30 cm in front of the mirror
(c) between 15 cm and 30 cm in front of the mirror.
(d) more than 30 cm in front of the mirror.
Question:11
A full-length image of a distance tall building can definitely be seen by using
(a) concave mirror
(b) convex mirror
(c) plane mirror
(d) both concave as well as plane mirror.
Question:12
In torches, search lights and headlights of vehicles the bulb is placed
(a) between the pole and the focus of the reflector
(b) very near to the focus of the reflector
(c) between the focus and center of curvature of the reflector
(d) at the center of curvature of the reflector
Question:13
The laws of reflection hold good for
(a) plane mirror only
(b) concave mirror only
(c) convex mirror only
(d) all mirrors irrespective of their shape
Question:14
The path of a ray of light coming from air passing through a rectangular glass slab traced by four students are shown as A, B, C and D in the figure. Which one of them is correct?
(a) A
(b) B
(c) C
(d) D
Question:15
You are given water, mustard oil, glycerin and kerosene. In which of these media, a ray of light incident obliquely at same angle would bend the most ?
(a) Kerosene
(b) Water
(c) Mustard Oil
(d) Glycerin
Question:16
Which of the following ray diagrams is correct for the ray of light incident on a concave mirror as shown in figure?
(a) Fig. a
(b) Fig. b
(c) Fig. c
(d) Fig. d
Question:17
Which of the following ray diagrams is correct for the ray of light incident on a lens shown in figure ?
(a) Fig. a
(b) Fig. b
(c) Fig. c
(d) Fig. d
Question:18
A girl is standing in front of a magic mirror. She finds the image of her head bigger, the middle portion of her body of the same size and that of the legs smaller. The order of combinations for the magic mirror from the top:
(a) Plane, convex and concave
(b) Convex, concave and plane
(c) Concave, plane and convex
(d) Convex, plane and concave
Question:19
In which of the following, the image of an object placed at infinity will be highly diminished and point sized?
(a) Concave mirror only
(b) Convex mirror only
(c) Convex lens only
(d) Concave mirror, convex mirror, concave lens and convex lens.
Question:20
Identify the device used as a spherical mirror or lens in the following cases, when the image formed is virtual and erect in each case.
(a) Object is placed between device and its focus, image formed is enlarged and behind it.
(b) Object is placed between the focus and device, image formed is enlarged and on the same side as that of an object.
(c) Object is placed between infinity and device, image formed is diminished and between focus and optical center on the same side as that of the object.
(d) Object is placed between infinity and device, image formed is diminished and between pole and focus, behind it.
Question:21
Answer:Question:22
Answer:Question:23
Answer:Question:24
Answer :Question:25
Answer:Question:26
Answer:Question:27
Answer:Question:28
Answer:Question:29
Answer:Question:30
Draw ray diagrams showing the image formation by a concave mirror when an object is placed
(a) between pole and focus of the mirror
(b) between focus and centre of curvature of the mirror
(c) at centre of curvature of the mirror
(d) a little beyond centre of curvature of the mirror
(e) at infinity
Question:31
Draw ray diagrams showing the image formation by a convex lens when an object is placed
(a) between optical centre and focus of the lens
(b) between focus and twice the focal length of the lens
(c) at twice the focal length of the lens
(d) at infinity
(e) at the focus of the lens
Question:32
Answer:
Laws of refraction:
Question:33
Draw ray diagrams showing the image formation by a concave lens when an object is placed
(a) at the focus of the lens
(b) between focus and twice the focal length of the lens
(c) beyond twice the focal length of the lens
Question:34
Draw ray diagrams showing the image formation by a convex mirror when an object is placed
(a) at infinity
(b) at finite distance from the mirror
Question:35
Answer :
The image is obtained on the screen so it is real.
Therefore, magnification, m = –3,
v = 80 cm
Now, $m=\frac{v}{u}$
Therefore,
$-3=\frac{80}{u}$
$u=\frac{-80}{3}cm$
$f=\left ( \frac{1}{v} \right )-\left ( \frac{1}{u} \right )=\left ( \frac{1}{80} \right )+\left ( \frac{3}{80} \right )=\frac{1}{20}$
$f=20\; cm$
The lens is convex and image formed at 80 cm from the lens is real and inverted.
Question:36
Answer:
Using,Question:37
Answer:Question:38
A student focused the image of a candle flame on a white screen using a convex lens. He noted down the position of the candle screen and the lens as under
Position of candle = 12.0 cm
Position of convex lens = 50.0 cm
Position of the screen = 88.0 cm
(i) What is the focal length of the convex lens?
(ii) Where will the image be formed if he shifts the candle towards the lens at a position of 31.0 cm?
(iii) What will be the nature of the image formed if he further shifts the candle towards the lens?
(iv) Draw a ray diagram to show the formation of the image in case (iii) as said above.
Answer:
Answer :Reflection of Light
Laws of Reflection
Image Formation by Plane Mirrors
Refraction of Light
Laws of Refraction
Refractive Index
Total Internal Reflection
Image Formation by Spherical Mirrors
Refraction through Lenses
Image Formation by Lenses
Applications of Reflection and Refraction
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These topics cover the essential concepts of light, including how it behaves when it reflects and refracts, and how these principles are applied in real-world situations.
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 |
Frequently Asked Questions (FAQs)
Light helps us to experience the world. Vision, photography, communications (such as fiber optics) and numerous technologies (such as lasers and solar panels) rely on it.
When light is confined to the same medium, it moves in straight line. It is able to reflect, refract and get absorbed depending on the surface they meet.
Upon incidence in a rarer medium at an angle sharper than the critical angle, light is totally reflected inside the denser medium. Optical fibers work on this principle.
It contains questions with multiple choice options, short answer questions, long answer questions, reasoning-based questions and application-based numerals to challenge the conceptual
The convex lens used to treat hypermetropia (farsightedness) converges light, whereas the concave lens used to treat myopia (nearsightedness) diverges light.
On Question asked by student community
Hello,
Yes, you can give the CBSE board exam in 2027.
If your date of birth is 25.05.2013, then in 2027 you will be around 14 years old, which is the right age for Class 10 as per CBSE rules. So, there is no problem.
Hope it helps !
Hello! If you selected “None” while creating your APAAR ID and forgot to mention CBSE as your institution, it may cause issues later when linking your academic records or applying for exams and scholarships that require school details. It’s important that your APAAR ID correctly reflects your institution to avoid verification problems. You should log in to the portal and update your profile to select CBSE as your school. If the system doesn’t allow editing, contact your school’s administration or the APAAR support team immediately so they can correct it for you.
Hello Aspirant,
Here's how you can find it:
School ID Card: Your registration number is often printed on your school ID card.
Admit Card (Hall Ticket): If you've received your board exam admit card, the registration number will be prominently displayed on it. This is the most reliable place to find it for board exams.
School Records/Office: The easiest and most reliable way is to contact your school office or your class teacher. They have access to all your official records and can provide you with your registration number.
Previous Mark Sheets/Certificates: If you have any previous official documents from your school or board (like a Class 9 report card that might have a student ID or registration number that carries over), you can check those.
Your school is the best place to get this information.
Hello,
It appears you are asking if you can fill out a form after passing your 10th grade examination in the 2024-2025 academic session.
The answer depends on what form you are referring to. Some forms might be for courses or examinations where passing 10th grade is a prerequisite or an eligibility criteria, such as applying for further education or specific entrance exams. Other forms might be related to other purposes, like applying for a job, which may also have age and educational requirements.
For example, if you are looking to apply for JEE Main 2025 (a competitive exam in India), having passed class 12 or appearing for it in 2025 are mentioned as eligibility criteria.
Let me know if you need imformation about any exam eligibility criteria.
good wishes for your future!!
Hello Aspirant,
"Real papers" for CBSE board exams are the previous year's question papers . You can find these, along with sample papers and their marking schemes , on the official CBSE Academic website (cbseacademic.nic.in).
For notes , refer to NCERT textbooks as they are the primary source for CBSE exams. Many educational websites also provide chapter-wise revision notes and study material that align with the NCERT syllabus. Focus on practicing previous papers and understanding concepts thoroughly.
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