Question

The radius of curvature of a concave mirror is 40cm. What is its focal length? ​

Answer 1

Answer:

$f = 1 \div r \\ \\ f = 1 \div 40 \\ \\ as \: is 1 \div f$

Answer 2

꧁ANSWER꧂

Since the focal length is half the length of the radius of curvature. The focal length comes out to be 20 cm.

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