Refraction of light (Question 1 (8 Marks)) — UPSC Physics Optional IFoS 2022 Paper I

A transmission hologram is recorded in a medium of refractive index 1\cdot 15. If the spacing between the two consecutive maxima is 557\text{ nm} and the angle of incidence of reference and object waves from the reference axis (say z-direction) is 30^\circ, find the wavelength of the light source.