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Q.

A point object is placed at a distance of 25 cm from a convex lens of focal length 20 cm. If a glass slab of thickness t and refractive index 1.5 is inserted between the lens and the object, the image is formed at infinity. The thickness t is

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a

10 cm

b

5 cm

c

20 cm

d

15 cm

answer is D.

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Detailed Solution

For the image to form at infinity the object must be at focus of the lens and hence the shift is 25 - 20=5 cm. We know 5=t1−23⇒t=15cm

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