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An object 15cm high is 30cm from pin-hole camera. If the ...

An object 15cm high is 30cm from pin-hole camera. If the height of the image formed at the back of the camera is 10cm, the image distance is

A.

20cm

B.

45cm

C.

54cm

D.

63cm

E.

70cm

Correct answer is A

image heightobject height = image distanceobject distance

1015 = image distance30

image distance = 20cm