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A plano convex lens is made refractive index 1.6. The radius of curvature of the curved surface is 60 cm. The focal length of the lens is
  • a)
    50 cm
  • b)
    100 cm
  • c)
    200 cm
  • d)
    400 cm
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
A plano convex lens is made refractive index 1.6. The radius of curvat...
Given data:
Refractive index of the lens, n = 1.6
Radius of curvature of the curved surface, R = 60 cm

Formula used:
The focal length of a plano-convex lens is given by the formula:
1/f = (n - 1)(1/R - 1/∞)
where f is the focal length of the lens, R is the radius of curvature of the curved surface and n is the refractive index of the lens.

Explanation:
Substituting the given values in the formula, we get:
1/f = (1.6 - 1)(1/60 - 0)
=> 1/f = 0.6/60
=> f = 60/0.6
=> f = 100 cm

Therefore, the focal length of the plano-convex lens is 100 cm.

Answer: Option (b) 100 cm.
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A plano convex lens is made refractive index 1.6. The radius of curvat...
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A plano convex lens is made refractive index 1.6. The radius of curvature of the curved surface is 60 cm. The focal length of the lens isa)50 cmb)100 cmc)200 cmd)400 cmCorrect answer is option 'B'. Can you explain this answer?
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