Q.

The aperture radius of thin convex lens is 2 mm. Find the radius of circular bright spot on screen

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a

1 mm

b

2 mm

c

3 mm

d

4 mm

answer is A.

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Detailed Solution

For lens, u=−30cm,f=20cm1v-1u=1for1v+130=120 v=+60cmFrom figure, tanθ=2mm60cm=r30cm∴r=1mm
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