Physics (2017) Discuss

Calculate the light of the image formed by a pinhole camera of length 12cm...

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Question 18
A

10 cm

B

16 cm

C

5 cm

D

14 cm

Explanation

Magnification = \(\frac{\text{Length of camera}}{\text{distance of object from pin hole}}\)

m = \(\frac{12}{60}\)

= 0.2

Also magnification m = \(\frac{\text{Height of image}}{\text{Height of object}}\)

Height of image = m \(\times\) height of object

= 0.2 \(\times\) 70

= 14cm


Correct option: D

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