A beam of parallel rays of width b cm propagates in glass at an angle theta . to its plane face. What would the beam width b , be after it goes over to air through this face ? (The refractive index of the glass is mu).

A beam of parallel rays of width b cm propagates in glass at an angle

1.	A beam of parallel rays of width b cm propagates in glass at an angle theta . to its plane face. What would the beam width b , be after it goes over to air through this face ? (The refractive index of the glass is mu).
Answer» `B MU` `b mu COS theta ` `(b(1 - mu^2 cos^2 theta)^(1//2))/(sin theta)` `(b(1-mu^2 sin^2 theta)^(1//2))/(cos theta)` Answer :C

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A beam of parallel rays of width b cm propagates in glass at an angle theta . to its plane face. What would the beam width b , be after it goes over to air through this face ? (The refractive index of the glass is mu).

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