A convex lens of focal length 25 cm and a
concave lens of focal length 10 cm are placed
in close contact with each other. Calculate the
lens power of this combination. [AI 2013]
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Answer:
Given the focal length of the convex lens, F = 25 cm. The focal length of the concave lens, f = - 10 cm. Hence, the lens power of this combination is.
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