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प्रश्न
How is the critical angle related to the refractive index of a medium?
उत्तर
The relationship is `""_amu_m = 1/sin C`
When a light beam enters a liquid (m) from point A, it becomes ∠i = C with normal and emerges from the liquid in medium air, which is rarer, producing ∠r = 90°, or the ray BO becoming parallel to the liquid surface.
∴ `""_mmu_a = sin i/sin r = sin C/(sin 90°)`
Or `""_amu_m = (sin 90°)/sin C = 1/sin C`
∴ `""_amu_m = "R.I of medium" = 1/sin C`
संबंधित प्रश्न
Explain the term critical angle with the aid of a labelled diagram.
State the approximate value of the critical angle for glass-air surface.
State the approximate value of the critical angle for water-air surface.
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 ______.
The critical angle for glass-air interface is ______.
- red light,
- blue light?
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°:
