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A point object is placed at a distance 25 cm from a convex lens of focal length 20 cm. If a glass slab of thickness  and refractive index 1.5 is inserted between the lens and object, image is formed at. Thickness t is found to be  times of 5 cm. Find



Question ID - 154115 | SaraNextGen Top Answer

A point object is placed at a distance 25 cm from a convex lens of focal length 20 cm. If a glass slab of thickness  and refractive index 1.5 is inserted between the lens and object, image is formed at. Thickness t is found to be  times of 5 cm. Find

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Answer Key / Explanation : (3) -

(3)

Image is at , so apparent position of object is at focus.  cm

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