Physics - Geometrical Optics Question with Solution | TestHub

A thin plate of transparent plastic is embedded in a thick slab of glass. The index of refraction of the glass is $\mathrm{n}=1.50$; the index of refraction of the plate changes as shown in the diagram.

A beam of light passes through glass and strikes the surface of the plastic plate. The maximum angle of incidence ${\theta }_{\text{max }}$ enables the beam to pass through the plate. Find ${\theta }_{\text{max }}($ in ${}^{\circ })$.