Consider a ray of single-wavelength light that strikes a rectangular glass block

Question

Consider a ray of single-wavelength light that strikes a rectangular glass block at an angle of incidence of 45degree. The light exits the glass block through the side that is parallel to the side where the light entered. Which one of the following statements is correct concerning the ray of light exiting the glass block (i.e. the outgoing ray)? The outgoing ray is parallel to the incident ray, but is offset from the path of the incident ray. The outgoing ray is traveling in the same direction as the incident ray (no deviation or offset). The angle of the outgoing ray with the normal to the surface is less than 45degree.

Explanation / Answer

Here ,

angle of incidence , i = 45 degree

as after coming out of the glass , the angle of refraction out from the glass is also same as the angle of incidence .

hence ,

the outgoing ray is parallel to the incident ray ,but is offset from the path of incident ray

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