If the space between the lenses in the lens combination shown were filled with water, what should happen to the focal length and power of the lens combination?

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Focal length: Decreased; Power: increased

Focal length: Decreased; Power: unchanged

Focal length: Increase; Power: unchanged

Focal length: Increased; Power: decreased

answer is D.

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Detailed Solution

P=μ−11R1−1R2μ decreases, P decrease. f increases.

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