A circular opaque disc just blocks all light escaping directly from a source 10 cm below a liquid surface. If the disc radius is 10 cm, the refractive index of the liquid is:
Options

Question

A circular opaque disc just blocks all light escaping directly from a source 10 cm below a liquid surface. If the disc radius is 10 cm, the refractive index of the liquid is:

G1 Physics · Accepted Answer

r=h implies tanC=1, so C=45° and μ=1/sin45°=√2.