NCERT Solutions for Class 7 Science Chapter 15 Light

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Written by Team Trustudies
Updated at 2021-02-11


NCERT solutions for class 7 Science Chapter 15 Light Exercise

Q.1 Fill in the blanks:
(a) An image that cannot be obtained on a screen is called ___________.
(b) Image formed by a convex _________ 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.



NCERT Solutions for Class 7 Science Chapter 15 Light


Answer :

(a) An image that cannot be obtained on a screen is called ___virtual image___.
(b) Image formed by a convex __mirror__ 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.

Q.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)



NCERT Solutions for Class 7 Science Chapter 15 Light


Answer :

(a) We can obtain an enlarged and erect image by a convex mirror. (F)
(b) A concave lens always form a virtual image. (T)
(c) We can obtain a real, enlarged and inverted image by a concave mirror. (T)
(d) A real image cannot be obtained on a screen. F)
(e) A concave mirror always form a real image. (F)

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

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



NCERT Solutions for Class 7 Science Chapter 15 Light


Answer :

(a) A plane mirror ?(v) The image is erect and of thesame size as the object.
(b) A convex mirror ? (ii) Can form image of objectsspread 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.

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



NCERT Solutions for Class 7 Science Chapter 15 Light


Answer :

The image formed by a plane mirror is erect, laterally inverted, and of the same size as that of the object. The left side of the object appears on the right side of the image. Also, the distance of the image from the plane mirror is same as the distance between the plane mirror and the object.

Q.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.



NCERT Solutions for Class 7 Science Chapter 15 Light


Answer :

If the letters of English alphabet A, H, I, M, O, T, U, V, W, X, Y are kept in front of a plane mirror, then they would form images which exactly look like the original letters of the alphabet.

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



NCERT Solutions for Class 7 Science Chapter 15 Light


Answer :

When an image cannot be obtained on a screen, it is called a virtual image. The image formed by a plane mirror is virtual, because the image cannot be obtained on a screen.

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



NCERT Solutions for Class 7 Science Chapter 15 Light


Answer :

(i) Convex lens is thicker in the middle while concave lens is thinner in the middle. (ii) A convex lens converged the light ray falling on it, while a concave lens diverges the light ray falling on it. (iii) the concave lens can real images formed, while the convex lens can virtual image formed.

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



NCERT Solutions for Class 7 Science Chapter 15 Light


Answer :

(a) Concave mirror – in bike and car headlight
(b) Convex mirror – in side view mirror of vehicle

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



NCERT Solutions for Class 7 Science Chapter 15 Light


Answer :

Concave mirror

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



NCERT Solutions for Class 7 Science Chapter 15 Light


Answer :

Concave lens

Q.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



NCERT Solutions for Class 7 Science Chapter 15 Light


Answer :

(ii) concave mirror

Q.12. David is observing his image in a plane mirror. Die 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



NCERT Solutions for Class 7 Science Chapter 15 Light


Answer :

(iii) 6 m

Q.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 mew 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



NCERT Solutions for Class 7 Science Chapter 15 Light


Answer :

(iii) 4 m/s



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