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Correct option is B)

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

$R_{2}=3_{2}+(R−103 )_{2}$

Solving this, we get

$R=15.15cm$

Speed of light in any medium is $μc $ where $c=3×10_{8}m/s$ and $μ$ is the refractive index.

For the lens, $μc =2×10_{8}m/s$

$μ=2×10_{8}3×10_{8} =1.5$

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

$f1 =(μ−1)(R1 )=(1.5−1)(15.151 )cm_{−1}$

Solving this, we get $f≈30cm$

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