A ray of light falls on a glass plate of refractive index mu=1.5. What is the angle of incidence of the ray if the angle between the reflected and refracted rays is 90^@?
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Answer:
it will be 90 degree .
Explanation:
refer science textbook
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The angle of incidence of the ray is :
Given : Refractive index = 1.5 , mu1 = 1
• Also given that angle between the reflected and refracted rays is 90, that means light after reflecting gets completely polarized.
• Rays is traveling from air to glass medium.
Using Snell's law,
mu1 sin i = m2 sin t
where t = transmitted ray angle
• angle t + angle r = 90
• And we also know by reflection law that,
• angle i = angle r
1×sin i = 1.5×sin(90-r) = 1.5×cos r = 1.5×cos i
sin i / cos i = 1.5
• tan i = 1.5 => i = tan^-1 ( 1.5 )
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