Question

A concave lens of focal length 25cm has its
power in diaptres is;
​

Answer 1

$\huge\mathit\red{P=1/F}$

⚫P=1/25

⚫P=0.04cm

⚫P=4 m

⚫P=4 diop.

Hence,lens is concave

So,

P=-4 dio.

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