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Geometrical Optics question

2022 · Q130
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Geometrical Optics question

2022 · Q130

NEETPhysicsGeometrical OpticsMCQ+4 / −1

A biconvex lens has radii of curvature, 20 cm each. If the refractive index of the material of the lens is 1.5, the power of the lens is

  1. A
    +2 D
  2. B
    +20 D
  3. C
    +5 D
  4. D
    Infinity
View written solutionFree

Correct answer: C

Power of lens is given by

$P = {1 \over {f(m)}}$

$${1 \over f} = (\mu - 1)\left( {{1 \over {{R_1}}} - {1 \over {{R_2}}}} \right)$$

$${1 \over f} = \left\{ {{3 \over 2} - 1} \right\}\left( {{1 \over {20}} + {1 \over {20}}} \right)$$

$f = 20$ cm

$$P = {1 \over {20 \times {{10}^{ - 2}}}}$$

$ = 5$ D

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