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in Physics by (71.4k points)

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 : 

(a) 10 cm 

(b) 5 cm 

(c) 20 cm 

(d) 15 cm

1 Answer

+1 vote
by (71.2k points)
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Best answer

Correct option: (d) 15 cm

Explanation:

Image will be formed at infinity if object is placed at focus of the lens, i.e., at 20 cm from the lens. Hence, 

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