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A point object in air is in front of the curved surface of a plano-convex lens. The radius of curvature of the curved surface is 30 cm and the refractive index of the lens material is 1.5, then the focal length of the lens is
  • a)
    40 cm
  • b)
    50 cm
  • c)
    60 cm
  • d)
    80 cm
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
A point object in air is in front of the curved surface of a plano-co...
Given: μ = 1.5; Rcurved = 30 cm
Using, Lens-maker formula
For plano-convex lens 12
R1 → ∞ then R2 = –R
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A point object in air is in front of the curved surface of a plano-convex lens. The radius of curvature of the curved surface is 30 cm and the refractive index of the lens material is 1.5, then the focal length of the lens isa)40 cmb)50 cmc)60 cmd)80 cmCorrect answer is option 'C'. Can you explain this answer?
Question Description
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