The radii of curvature of a double convex lens are 4   cm and 8   cm . If the refractive index of…

The radii of curvature of a double convex lens are 4 cm and 8 cm. If the refractive index of the material of the lens is 1.5, the focal length of the lens is nearly
  1. 16 cm
  2. 12.11 cm
  3. 7.33 cm
  4. 5.33 cm

Solution

From Lens maker's formula,
1f=μ2μ1-11R1-1R2⇒1f=1.51-110.04-1-0.08⇒f=5.33 cm
 

Asked in: AP EAMCET 2022 (04 Jul Shift 2)

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