Question

A ray of light of frequency 5xten power four Hz is passed through a liquid . The wave length of light measured inside the liquid is found 450x ten power minus nine metres . Calculate the refractive index of liquid.

Answer 1

The question seems wrong the frequency should be 5 * 10¹⁴ Always remember that the frequency always remains constant. so outside liquid speed = c = 3 * 10⁸m/s inside liquid v = wavelength * frequency = 450 * 10^-9* 5 * 10⁴ = 2250 * 10⁵= 2.25 * 10⁸ hence the refractive index = velocity of light in air/ velocity of light in liquid = 3* 10⁸/ 2.25 * 10⁸​​ ​​​​​​​ ​​​​​ = 1.333