Cross section of a glass prism has the form of an equilateral triangle. A ray is incident onto one of the faces perpendicular to it. Angle φ between the incident ray and the ray that leaves the prism in degree is ………× 60º. The refraction index of glass is 1.5.
Text Solution
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Sol.
1.5 × sin60º = 1 × sin r
1.5 × 
= sin r
× 
= sin r
= sin r
sin r > 1
∴ T/R will take place
angle = 120º
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