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Power and Thin Lenses in Contact

A convex lens...

Question

A convex lens is placed in contact with a mirror as shown. If the space between them is filled with water, its power will

A

decrease

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B

increase

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C

remain unchanged

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D

increase or decrease depending on the focal length.

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Solution

The correct option is A decrease
The power of the given system is a combination of the positive power of the convex lens, negative power of the plano-concave lens of water and zero power of the plane mirror. Clearly, the power of the system decreases.

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