An object is away from a concave mirror and its image is from the mirror.The focal length and radius of curvature of the mirror, and the magnification of the image is:

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f = 9.6 cm, R = - 19.2 cm, m = - 2 / 3

f = 8.6 cm, R = - 18.2 cm, m = - 2 / 3

f = 12.6 cm, R = - 13.2 cm, m = - 2 / 3

f = 13.6 cm, R = - 18.2 cm, m = - 2 / 3

answer is A.

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Detailed Solution

Concept- The focal length of the mirror may be calculated using the lens formula. On the same side of the lens as the item is the concave mirror's image. The mirror or lens's radius of curvature is twice that of the mirror's focal length.
Utilising the formula:

The focal length in this case is f, the object distance is v, and the image distance is u.
Given
Object distance,

Image distance,

From mirror formula

focal length
Radius of curvature

magnification,

Hence, the correct option is 1.

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