NCERT Solutions For Class 7 Science Chapter 15 - Light

NCERT Solutions For Class 7 Science Chapter 15 PDF Free Download

NCERT solutions for class 7 science chapter 15 Light solution is provided here. In this chapter, students will learn about Light, reflection of light and many more. To score good marks in class 7 examination students should try to solve the NCERT questions provided at the end of each chapter. Solving NCERT questions provided at the end of each chapter will help you to know about the chapter in very detailed way. 

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Exercise Questions

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.

Solution:

(a) An image that cannot be obtained on a screen is called virtual image.

(b) Image formed by a convex mirror is always virtual and smaller in size.

(c) An image formed by a plane 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 real image.

(e) An image formed by a concave lens cannot be obtained on a 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)

Solution:

a) False

b) True

c) True

d) False

e) False

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 image of objects spread over a large area.

(c) A convex lens

(iii) Used by dentists to see 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.

Solution:

Column-I

Column-II

(a) A plane mirror

(v) The image is erect and of the same size as the object.

(b) A convex mirror

(ii) Can form an image of objects spread over a large area.

(c) A convex lens

(i) Used as a magnifying glass

(d) A concave mirror

(iii) Used by dentists to see an enlarged image of teeth.

(e) A concave lens

(vi) The image is erect and smaller in size than the object.

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

Solution:

Characteristics of the image formed by a plane mirror are as follows:

  • Image distance and object distance are equal
  • Size of object and image are equal
  • The image formed is erect and virtual
  • Images are laterally inverted

5. Find out the letters of 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.

Solution:

A, H, I, M, O, T, U, V, W, X, Y  alphabets form images in a plane mirror exactly like the letter itself because these alphabets are laterally symmetric.

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

Solution:

Ther image that cannot be obtained on a screen is called virtual image. The image formed by a plane mirror is virtual.

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

Solution:

Convex Lens

Concave Lens

Thick in the middle and thin at the edge

Thin in the middle and thick at the edge

Image formed is virtual

Image formed is real

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

Solution:

Concave mirrors are used in the headlight of cars and scooters.

Convex mirrors are used as side-view mirrors in vehicles.

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

Solution:

The concave mirror can form a real image.

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

Solution:

A convex mirror form a virtual image.

Choose the correct option in questions 11–13

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

Solution:

The answer is (ii) concave mirror

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

Solution:

The answer is (iii) 6 m

13. The rear view 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

Solution:

The answer is (iii) 4 m/s

Can you imagine a world without light? Wouldn’t it be scary? Humans are creatures of the light; we have evolved through millions of years to avoid the dangers of the dark. Light is necessary for us, but we don’t take the trouble to understand it. Does it travel as a wave or as a particle? Why does it make some things appear in one colour while few others in another? All the topics in the 7th class science chapter 15 are covered in this NCERT Solutions. Download the free PDF of light class 7 notes, worksheets, questions and answers provided here, if necessary, take a printout to keep it handy during the preparation of exams.

Important topics covered in NCERT Solutions for Class 7 Science Chapter 15 Light

1

Light Travels Along A Straight Line

2

Reflection Of Light

3

Right Or Left!

4

Playing With Spherical Mirrors

5

Images Formed By Lenses

6

Sunlight — White Or Coloured?

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Frequently Asked Questions on Light

What is virtual image?

An image that cannot be obtained on a screen is called virtual image.

What is real image?

An image which can be obtained on a screen is called a real image.

Is convex mirror is smaller in size?

Image formed by a convex mirror is always virtual and smaller in size.

Which type of mirror can form a real image?

The concave mirror can form a real image.

Which type of lens forms always a virtual image?

A convex mirror form a virtual image.

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