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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

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For lens, u=−30cm,f=20cm

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1v-1u=1f

⇒1v+130=120

⇒v=+60cm

From figure, tanθ=2mm60cm=r30cm

∴r=1mm

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