Ncert solutions

Ncert solutions

Grade 7

Light | Exercise

Question 12

Q12) 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:

(iii) 6m.

Initially, David is standing in front of the mirror. The distance between the mirror and his image= 4m.

David moves 1m towards the mirror. The distance of David from the mirror will be 3m.

The distance of the image from the mirror = 3m. Therefore the distance between David and his image= 3m + 3m =6m.

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Question 12

Q12) 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:

(iii) 6m.

Initially, David is standing in front of the mirror. The distance between the mirror and his image= 4m.

David moves 1m towards the mirror. The distance of David from the mirror will be 3m.

The distance of the image from the mirror = 3m. Therefore the distance between David and his image= 3m + 3m =6m.

Still have questions? Our expert teachers can help you out

Book a free class now

Want to top your science exam ?

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subject-cta
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