A light beam has wavelength in air

PHYSICS · Multi-part · A Level · Physics · Waves · Waves

Problem

A light beam has wavelength

650\,\text{nm}

in air. On entering medium

A

its wavelength becomes

500\,\text{nm}

and after subsequently entering medium

B

it is reduced to

400\,\text{nm}

. Calculate: (i) the refractive index of medium

A

with respect to air (ii) the refractive index of medium

B

with respect to air (iii) the refractive index of medium

B

with respect to medium

A