Q114 / 120 · VITEEE 2016 · Physics

Two lenses of focal length $f_{1}=10 \mathrm{~cm}$ and $f_{2}=-$ $20 \mathrm{~cm}$ are kept as shown. The resultant power of combination will be Figure

  • A
    $-10 \mathrm{D}$
  • B
    $5 \mathrm{D}$
  • C
    0
  • Correct answer
    D
    $10 \mathrm{D}$

Solution

$P=2\left[\frac{100}{10}+\frac{100}{-20}+0\right]$ $P=10$ dioptre.

Hence, the correct answer is option: 'D'.

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