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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 6k (in cm). Where k is positive integer. Find the value of k
 
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answer is 3.

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Detailed Solution

P=2pL1+2pL2+Pm

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