NCERT Solutions for Class 7 Science Chapter 15 Light

Edited By Vishal kumar | Updated on Sep 20, 2023 12:17 PM IST

NCERT Solutions for Class 7 Science Chapter 15- Access and Download Free PDF

NCERT Solutions for Class 7 Science Chapter 15 Light: Solution for chapter 15 science class 7th are the part of NCERT Solutions for Class 7 Science. Learning through activities makes a chapter interesting. The chapter light has many activities which makes it very easy to understand. Along with these activities if you have NCERT solutions of C lass 7 Science chapter 15 Light in hand, then scoring good marks in the exam is an easy thing. The NCERT solutions for Class 7 Science chapter 15 Light give an explanation for 13 questions and two of them are simple numerical problems. While going through this chapter you will come across concepts like the applications of concave mirror and lens, how the image is visible in a plane mirror, what are the properties of image formed by a plane mirror, convex and concave mirror and lens etc.

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NCERT Solutions for Class 7 Science Chapter 15- Access and Download Free PDF
NCERT Solutions For Class 7 Science Chapter 15 Light: Exercise Solutions
Class 7 Science Chapter 15 NCERT Solutions: Important Formulas and Points
Lenses
key Features of Class 7 Science Chapter 15 NCERT Solutions

The NCERT solutions for Class 7 Science chapter 15 Light helps to understand these concepts well. While learning a chapter, first of all, try to answer all the questions by yourself. Then, if you need any help then refer to NCERT Solutions for the respective chapters. Students are recommended to go through NCERT Solutions for Class 7 to score high marks in their examination.

**As per the CBSE Syllabus 2023-24, this chapter has been renumbered as Chapter 11 in Class 7 Science.

Free download class 7 science chapter 15 question answer PDF for CBSE exam.

Download the PDF of NCERT Solutions for Class 7 Science Chapter 15 Light

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NCERT Solutions For Class 7 Science Chapter 15 Light: Exercise Solutions

1. Fill in the blanks:
(a) An image that cannot be obtained on a screen is called____________.
(b) Image formed by a convex __________ is always virtual and smaller in size.
(c) An image formed by a __________ mirror is always of the same size as that of the object.
(d) An image which can be obtained on a screen is called a _________ image.
(e) An image formed by a concave ___________ cannot be obtained on a screen.

Answer:

(a) virtual image. Only real images can be obtained on the screen.

(b) mirror.

(d) real image. On these type of images can be obtained on the screen.

(e) concave lens. As virtual images cannot be obtained on the screen.

2. Mark ‘T’ if the statement is true and ‘F’ if it is false:
(a) We can obtain an enlarged and erect image by a convex mirror. (T/F)
(b) A concave lens always form a virtual image. (T/F)
(c) We can obtain a real, enlarged and inverted image by a concave mirror. (T/F)
(d) A real image cannot be obtained on a screen. (T/F)
(e) A concave mirror always form a real image. (T/F )

Answer:

(a) False. As the size of the image formed is smaller.

(b) True.

(d) False. Real images can be obtained on screens whereas virtual images cannot be.

(e) False. As the nature of the image is decided by the distance between the object and mirror.

3. Match the items given in Column I with one or more items of Column II.

Column I	Column II
(a) A plane mirror	(i) Used as a magnifying glass.
(b) A convex mirror	(ii) Can form an image of objects spread over a large area.
(c) A convex lens	(iii) Used by dentists to see an enlarged image of teeth.
(d) A concave mirror	(iv) The image is always inverted and magnified.
(e) A concave lens	(v) The image is erect and of the same size as the object.
	(vi) The image is erect and smaller in size than the object.

Answer:

(a) The image formed by a plane mirror is erect and of the same size.

(b) The image formed by a concave mirror is inverted and magnified. Also, they can form images of objects spread over a large area.

(d) A concave mirror is used to see enlarged images.

(e) The image formed by a concave lens is erect and smaller in size.

4 . State the characteristics of the image formed by a plane mirror.

Answer:

An image formed by a plane mirror is:-

(i) virtual

(ii) erect

(iii) of the same size

5 . Find out the letters of the English alphabet or any other language known to you in which the image formed in a plane mirror appears exactly like the letter itself. Discuss your findings.

Answer:

The letter which has vertical symmetry will have this property.

In English alphabets, we have A, H, I, M, O, T, U, W, X, X, Y that appears exactly like itself in the plane mirror.

6. What is a virtual image? Give one situation where a virtual image is formed.

Answer:

The image which can be screened (or obtained on screen) is known as a virtual image.

For e.g. in case of a candle which is placed in front of a plane mirror, we observe a virtual image of the candle formed behind the mirror.

7 . State two differences between a convex and a concave lens.

Answer:

The basic difference between the two are given below:-

(i) In the case of a convex lens, it converges the falling rays of light whereas in the case of the concave lens the rays diverge.

(ii) A concave lens has thick edges and is thin at the middle but the convex lens is thick at the middle.

8. Give one use each of a concave and a convex mirror.

Answer:

The side-view mirror in a vehicle is a convex mirror for getting wider view of the rear.

To see an enlarged image of teeth, dentists use a concave mirror.

9. Which type of mirror can form a real image?

Answer:

A concave mirror can form real images which can be obtained on the screen. The nature of the image formed by these mirrors depends upon the distance between the object and mirror.

10 . Which type of lens forms always a virtual image?

Answer:

The images formed by a concave lens is always virtual, magnified and erect in nature.

11 . A virtual image larger than the object can be produced by a
(i) concave lens (ii) concave mirror
(iii) convex mirror (iv) plane mirror

Answer :

The correct answer is a concave mirror. The image formed by a concave mirror can be both virtual or real depending on the position of the object. Also, the image obtained is magnified.

12 . David is observing his image in a plane mirror. The distance between the mirror and his image is 4 m. If he moves 1 m towards the mirror, then the distance between David and his image will be
(i) 3 m (ii) 5 m (iii) 6 m (iv) 8 m

Answer:

We are given the distance between the mirror and his image = 4 m

Now, if David moves 1 m towards the mirror, then the distance is = 4 − 1 = 3 m

Hence, the distance between David and his image is = 3 + 3 = 6 m.

13 . The rearview mirror of a car is a plane mirror. A driver is reversing his car at a speed of 2 m/s. The driver sees in his rear view mirror the image of a truck parked behind his car. The speed at which the image of the truck appears to approach the driver will be
(i) 1 m/s (ii) 2 m/s (iii) 4 m/s (iv) 8 m/s

Answer:

We are given that the speed of the car is 2 m/s which implies, the car is approaching the truck with a speed of 2 m/s.

Hence the speed at which the image of the truck appears to approach the driver will be: 2 $\times$ 2 = 4 m/s

The NCERT class 7th science chapter 15 question answer consist of a total of thirteen questions that include multiple-choice, matching, and true/false type questions. The solutions, created by the experts at Careers360, are in accordance with the latest CBSE syllabus. The solutions are explained in detail and in easy-to-understand language. Students can download the PDF version of the solutions and use them offline for their convenience.

Chapter-wise NCERT Solutions of Class 7 Science

Chapter 1	Nutrition in Plants
Chapter 2	Nutrition in Animals
Chapter 3	Fibre to Fabric
Chapter 4	Heat
Chapter 5	Acids, Bases and Salts
Chapter 6	Physical and Chemical Changes
Chapter 7	Weather, Climate and Adaptations of Animals to Climate
Chapter 8	Winds, storms and cyclones
Chapter 9	Soil
Chapter 10	Respiration in Organisms
Chapter 11	Transportation in Animals and Plants
Chapter 12	Reproduction in Plants
Chapter 13	Motion and Time
Chapter 14	Electric Current and its Effects
Chapter 15	Light
Chapter 16	Water: A Precious Resource
Chapter 17	Forests: Our Lifeline
Chapter 18	Wastewater Story

Class 7 Science Chapter 15 NCERT Solutions: Important Formulas and Points

Light

Light is a form of energy that enables us to see objects around us.
It travels in straight lines and at a very high speed, approximately 3 × 10^8 meters per second in a vacuum.

Sources of Light:

Natural Sources: The Sun is the primary natural source of light. It emits light due to nuclear reactions.

Artificial Sources: Artificial sources of light include electric bulbs, candles, and lamps, which produce light through various means.

Reflection and Laws of Reflection

Reflection of light is the process by which light waves encounter a surface and bounce back in the same medium, obeying certain rules. It occurs when light rays strike an object or surface that does not absorb the light but instead sends it back. This phenomenon is responsible for our ability to see objects, as the reflected light enters our eyes.

Laws of Reflection

The incident ray (incoming ray), the reflected ray (outgoing ray), and the normal (a line perpendicular to the surface) all lie in the same plane.
The angle of incidence (the angle between the incident ray and the normal) is equal to the angle of reflection (the angle between the reflected ray and the normal).

Mathematically, the law of reflection can be expressed as:

Angle of Incidence (i) = Angle of Reflection (r)

Lenses

Refraction

Refraction is when light bends as it moves from one material to another.
After refraction, we see an apparent object, which may not be in the same place as the actual object due to the bending of light.

Image Formation by Lenses

Convex lenses (like a magnifying glass) can form real, inverted, and smaller images. When objects are very close, the image may be erect, virtual, and larger.
Concave lenses (used in cameras and binoculars) create virtual, erect, and smaller images.

Dispersion of White Light

White light, like sunlight, is made up of seven colours: violet, indigo, blue, green, yellow, orange, and red.
Passing white light through a prism or seeing it on a CD separates it into these colours, creating a rainbow.
This separation of white light into its component colours is called dispersion.

Light Class 7 Science Chapter 15-Topics

Light Travels Along a Straight Line
Reflection of Light
Right or Left!
Playing With Spherical Mirrors
Images Formed by Lenses
Sunlight — White or Coloured?

Importance of NCERT Solutions for Class 7 Science Chapter 15 Light:

A tool like NCERT solutions for Class 7 Science chapter 15 Light helps students to solve homework problems
With the help of NCERT solutions of C lass 7 Science chapter 15 Light students can perform well in Class 7 exams
NCERT solutions for Class 7 Science chapter 15 Light covers questions related to all the concepts studied in the chapter.
The concepts studied in this chapter are revised in the coming classes also.

key Features of Class 7 Science Chapter 15 NCERT Solutions

Comprehensive Coverage: The NCERT class 7 science chapter 15 question answer cover all the topics and concepts presented in Chapter 15 of the Class 7 Science textbook, providing a thorough understanding of light-related phenomena.
Detailed Explanations: The class 7 light ncert solutions offer clear and detailed explanations for each question and exercise, making complex concepts easy to grasp for students.
Step-by-Step Approach: The light class 7 questions and answers follow a step-by-step approach, guiding students on how to solve problems and answer questions effectively.
Use of Simple Language: The solutions are presented in simple language suitable for Class 7 students, making it easier for them to understand and apply the concepts.
Practice Questions: The science chapter 15 class 7 often include practice questions and examples to reinforce the learning of key principles.
Exam Preparation: The class 7 science ch 15 question answer are designed to help students prepare for exams by offering a structured approach to answering questions and solving problems.
Clarity and Accuracy: The light class 7 ncert solutions are accurate and aligned with the content provided in the NCERT textbook, ensuring that students receive reliable information.
Accessible Format: NCERT light class 7 questions and answers can be accessed in various formats, including print, digital, and online resources, making them convenient for students to use for homework and revision.

These features make light class 7 solutions an invaluable resource for students to master the concepts related to light and its properties.

NCERT Solutions For Class 7 Subject Wise

NCERT Solutions for Class 7 Maths

NCERT Solutions for Class 7 Science

Also Check NCERT Books and NCERT Syllabus here

Frequently Asked Questions (FAQs)

1. Whether the Class 7 Science Chapter 15 Light is useful in higher studies ?

Yes, this chapter is very important for higher studies in the field of science and physics. Also, we will study in Class 10 Science NCERT syllabus and Class 12 Physics NCERT book.

2. What is light?

Light is a form of energy that is detected by the human eye. It is an electromagnetic wave.

3. Write the name natural source of light.

The natural sources of light are; lightning, stars, the sun, etc

4. What are the topics covered in NCERT Class Science chapter 15?

Here are the topics covered in NCERT Class 7 Science chapter 15

Light Travels Along a Straight Line
Reflection of Light
Right or Left!
Playing With Spherical Mirrors
Images Formed by Lenses
Sunlight — White or Coloured?

Also Read

NCERT Solutions for Class 7 Science Chapter 18 Wastewater Story

NCERT Solutions for Class 7 Science Chapter 17 Forests Our Lifeline

NCERT Solutions for Class 7 Science Chapter 16 Water A Precious Resource

NCERT Solutions for Class 7 Science Chapter 14 Electric Current and Its Effects

NCERT Solutions for Class 7 Science Chapter 13 Motion and Time

NCERT Solutions for Class 7 Science Chapter 12 Reproduction in Plants

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Option 1) decrease twice	Option 2) increase two fold
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