A biconvex lens has radii of curvature 20 cm each. If the refractive index of the material of the lens is 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. +20 D
  2. +5 D
  3. infinity
  4. +2 D

Solution

Power of the lens is,

P=1f=μ-11R1-1R2⇒P=1.5-110.2-1-0.2=0.5×10⇒P=+5 D

Asked in: NEET 2022 (Phase 1)

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