Question

Consider three converging lenses and  having identical geometrical construction. The refractive indices of and are  and  respectively. The upper half of the lens has refractive index   and the lower half has as shown in the figure. A point object O has an image at by the lens and at by the lens placed in the same position. If is placed at the same place:

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A

There will be an image at

B

There will be an image at

C

The only image will form somewhere between and

D

(a) and (b) are correct

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Updated on : 2022-09-05
Solution
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Correct option is D)

Since, due to lens , image is formed at , hence due to upper part of , image will be formed at .

And, due to lens , image is formed at , hence due to lower part of , image will be formed at .

Hence, image will be formed at both and .

Answer-(D).

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