Physics
Which colour of light has higher critical angle ? Red light or green light.
Refraction Plane Surfaces
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Answer
As we know, the relation between critical angle and refractive index is
where, c is critical angle and μ is refractive index.
As μ for red light is less as compared to that for green light and μ and c are inversely related.
Hence, the critical angle of red light is higher than that of green light.
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Related Questions
How is the critical angle related to the refractive index of a medium?
The critical angle for glass-air is 45° for the light of yellow colour. State whether it will be less than, equal to, or more than 45° for
(i) red light,
(ii) blue light ?
Fill in the blanks to complete the following sentences —
(a) Total internal reflection occurs only when a ray of light passes from a ………. medium to a ………. medium.
(b) Critical angle is the angle of ………. in denser medium for which the angle of ………. in rarer medium is ……….
State whether the following statement is true or false —
If the angle of incidence is greater than the critical angle, light is not refracted at all, when it falls on the surface from a denser medium to a rarer medium.