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A plano-convex lens is made of material of refractive index 1.6. The radius of curvature of the curved surface is 60 cm. The focal length of the lens is
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- 50 cm
- 100 cm
- 200 cm
- 400 cm
Correct Option: B
R1 = 60 cm, R2 = , µ = 1.6
| = (μ - 1) |  | - |  | |||||
| f | R1 | R2 |
| = (1.6 - 1) | | | ⇒ f = 100 cm | |||
| f | 60 |
R1 = 60 cm, R2 = , µ = 1.6
| = (μ - 1) | | - | | |||||
| f | R1 | R2 |
| = (1.6 - 1) | | | ⇒ f = 100 cm | |||
| f | 60 |
