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Question
The critical angle for glass-air interface is ______.
Options
24°
48°
42°
45°
Solution
The critical angle for glass-air interface is 42°.
Explanation:
For glass,
Refractive index `"_amu_g = 3/2`
∴ sin C = `1/("_amu_g) = 2/3`
As, sin 42° = `2/3`
∴ C = 42°
RELATED QUESTIONS
Explain the term critical angle with the aid of a labelled diagram.
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A light ray is incident from a denser medium on the boundary separating it from a rarer medium at an angle of incident equal to the critical angle. What is the angle of refraction for the ray?
Critical angle is the angle of ______ in denser medium for which the angle of ______ in rarer medium is ______.
- red light,
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Copy the diagram given below and complete the path of the light ray PQ, as it emerges out of the prism by necessary angles. The critical angle of glass is 42°:
