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A concave mirror of radius of curvature 20cm has a pin placed at 15cm from...

Physics
WAEC 1990
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?
  • A. 4.00
  • B. 2.00
  • C. 1.33
  • D. 1.50
  • E. 0.25
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Correct Answer: Option B
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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