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Course Contents $$ Ch$\mathrm{.}3\_1[$THE NATURE OF LIGHT$]$

Refracted Sunlight

Sunlight strikes a piece of crown glass at an angle of incidence of $33\mathrm{.}4$o$.$ Calculate the difference in the angle of refraction between a orange $(610$ nm$)$ and a blue $(470$ nm$)$ ray within the glass. The index of refraction is n$=1\mathrm{.}522$ for orange and n$=1\mathrm{.}531$ for blue light.

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The ray now travels inside the glass. What is the minimum angle of incidence at which the orange ray can hit the surface of the glass and become there totally internally reflected and not refracted?