A student passed a beam of laser light, of wavelength $=633nm,$ from air through a glass slab into some water. She recorded the information shown in the diagram.

$($a$)$ Calculate the refractive index of glass for the laser light.

$($b$)$ Determine the wavelength of the laser light in the glass slab.

$($c$)$ The water has a refractive index of $1*33.$ Calculate the angle $x.$

Ans: $($a$)1*67$

$($b$)378nm$

$($c$)x=58$