Monochromatic light of wavelength in air first enters medium X where its speed is and…

PHYSICS · Single correct · AP · Physics 2: Algebra-based · Geometric Optics · Geometric Optics

Problem

Monochromatic light of wavelength

500\,\text{nm}

in air first enters medium X where its speed is

2.0\times10^{8}\,\text{m s}^{-1}

and then passes into medium Y where the speed becomes

1.8\times10^{8}\,\text{m s}^{-1}

. What is the wavelength of this light in medium Y? (a)

450\,\text{nm}

(b)

333\,\text{nm}

(c)

300\,\text{nm}

(d)

556\,\text{nm}