The magnification of an object placed 10 cm from a convex mirror of radius of curvature 20 cm will be:
A
0.2
B
0.5
C
Infinity
D
1
Correct Option:
B
Explanation
For a convex mirror with radius of curvature R = 20 cm, the focal length is f = R/2 = +10 cm. With object distance u = −10 cm, the mirror formula 1/f = 1/v + 1/u gives v = +5 cm. Magnification is m = −v/u = −5/(−10) = 0.5.
