A concave mirror of radius of curvature 20cm has a pin placed at 15cm from its pole. What will be the magnification of the image formed?

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A. 4.00
B. 2.00
C. 1.33
D. 1.50
E. 0.25

Correct Answer:

Option B – 2.00

Explanation

1/U + 1/V = 1/f

f = r/2 = 10cm; 1/15 + 1/v = 1/10
v = 30 = m = v/u = 2

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