A ray of light is travelling from glass to air.For what angle of incidence will the ray emerge along the surface?Given that refractive index of glass is root 2.

Asked by ABHI BANSAL | 3rd Nov, 2010, 01:37: PM

Expert Answer:

Dear Student,
Snell's law states:
 

Ni * Sin(Ai) = Nr * Sin(Ar),

where:
Ni is the refractive index of the medium the light is leaving (glass, n = root 2)
Ai is the incident angle between the light ray and the normal to the meduim to medium interface, (i)
Nr is the refractive index of the medium the light is entering, (air, n =1)
Ar is the refractive angle between the light ray and the normal to the meduim to medium interface (90 degree)

Therefore,

sin i * √2 = sin 90 * 1

gives i = 45 degree.

Hope that satisfies your query.

Team

TopperLearning

Answered by  | 4th Nov, 2010, 11:10: AM

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