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Q.

In the figure shown, the radius of curvature of the left & right surface of the concave lens are 10 cm & 15 cm respectively. The radius of curvature of the mirror is 15 cm. The effective focal length of combination (thin lens) is k (in cm). Where k is positive integer. Find the value of k?

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answer is 18.

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Detailed Solution

$P = 2 P_{L 1} + 2 P_{L 2} + P_{m}$

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