Find the power of a concave lens of focal length 2 m.
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1
Answer:
The given focal length of the concave lens is f = -2 m. It is negative because a concave lens always has a negative focal length. The unit of power is dioptre (D) and 1D = 1m-1. Therefore, the correct answer for the given question is option (D).
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2
Answer:
The focal length of concave lens is negative .So power is also negative.
P=100/200cm = - 1/2 Dioptre.
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