Question

Find the power of the following lenses having focal length a) +25 cm b) - 200 cm


please answer the question correctly​

Answer 1

Answer:

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Answer 2

Answer:

Given,  lens of power P=(−2.0)D

Power, P=f1

             f=p1

                =−21 

             f=−0.5 m

Since focal length is negative, it is concave lens.