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- 15 cm
- 10 cm
- 20 cm
- 30 cm

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Solution

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To determine the radius of curvature R of the curved surface, we can write

R2=32+(R−310)2

Solving this, we get

R=15.15cm

Speed of light in any medium is cμ where c=3×108m/s and μ is the refractive index.

For the lens, cμ=2×108m/s

μ=3×1082×108=1.5

Putting these values in the lens makers formula for plano convex lens, we have,

1f=(μ−1)(1R)=(1.5−1)(115.15)cm−1

Solving this, we get f≈30cm

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