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If the magnification of a virtual image formed of an object 10cm from a convex...

Physics
JAMB 1980
If the magnification of a virtual image formed of an object 10cm from a convex lens is 3, then the focal length of the lens is
  • A. 10cm
  • B. 15cm
  • C. 16cm
  • D. 19cm
  • E. 20cm
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Correct Answer: Option B
Explanation
V = 3u, U = 10cm

therefore U = -ve,

F = \(\frac{UV}{U + V}\)

= \(\frac{10 \times (-30)}{10 - 30 }\)

= 15cm
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