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Question
The critical angle for glass-air interface is ______.
Options
24°
48°
42°
45°
MCQ
Fill in the Blanks
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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°
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