Question

A point object is placed at a distance of from a convex lens. Its focal length is . A glass slab of refractive index is inserted between the lens and the object, then the image is formed at infinity. Find the thickness of the glass slab (in cm).

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Solution
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Correct option is A)

When object is placed at the focus of the lens, i.e. at from the lens, image will be formed at infinity. Shift in the position of object:

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