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**The radius of the convex surface of a plano-convex lens is 20 cm and the refractive index of material of the lens is 1.5. The focal length of lens is **

### Options

(a) 30 cm

(b) 50 cm

(c) 20 cm

(d) 40 cm

### Correct Answer:

40 cm

### Explanation:

No explanation available. Be the first to write the explanation for this question by commenting below.

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Topics: Ray Optics
(94)

Subject: Physics
(2479)

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