A piece of material, suspected of being a stolen diamond (n = 2.42), is submerged in oil of refractive index 1.43 and illuminated by unpolarized light. It is found that the reflected light is completely polarized at an angle of $62 ^\circ$. Is it diamond? Explain.
Source: Giancoli, Douglas C., Physics: Principles with Applications, 7th Edition, 2014.
no, this is not diamond since the index of refraction is not 2.42