To find the focal length of a convex mirror, a student records the following data: Object pin Convex Lens Convex Mirror Image Pin 22.2 cm 32.2 cm 45.8 cm 71.2 cm The focal length of the convex lens is

Question

To find the focal length of a convex mirror, a student records the following data:

Object pin	Convex Lens	Convex Mirror	Image Pin
22.2 cm	32.2 cm	45.8 cm	71.2 cm

The focal length of the convex lens is $f_{1}$ and that of mirror is $f_{2}$ . Then taking index correction to be negligibly small, $f_{1}$ and $f_{2}$ are close to:

TestHub · Accepted Answer

Take f 2 = 12.7 1 f = 1 v + 1 u 1 12.7 = 1 25.4 + 1 u 1 12.7 = 1 25.4 = 1 u u = 25.4 = v ′ 1 f = 1 v - 1 u 1 f 1 = 1 25.4 + 13.6 + 1 10 1 f 1 = 1 39 + 1 10 1 f 1 = 390 49 = 7.96 The closest answers is (1) as option (3) and (4) are not possible.

Physics - Geometrical Optics Question with Solution | TestHub

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