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Question

Question: If a convex lens of focal length 40 cm forms real image of an object over a screen at 180 cm from th...

If a convex lens of focal length 40 cm forms real image of an object over a screen at 180 cm from the object for two positions of lens between object and the screen. The distance between two positions is –

A

40 cm

B

80 cm

C

60 cm

D

90 cm

Answer

60 cm

Explanation

Solution

u = \ u = 120 cm, 60 cm

\ Required distance = 120 – 60 = 60 cm