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A thin equiconvex lens `(mu=3//2)` of focal length 10cm is cut and separated and a material of refractive index 3 is filled between them. What is the

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A thin equiconvex lens `(mu=3//2)` of focal length 10cm is cut and separated and a material of refractive index 3 is filled between them. What is the focal length of the combination?
image
A. `2.5 cm`
B. `10 cm`
C. `-2.5 cm`
D. `-10 cm`
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Correct Answer - A
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