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It gets refracted so that its direction of propagation is the boundary line.

Q: What happens to light when it strikes the boundary of the two media an angle equal to the critical angle?

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The definition of critical angle is the angle of incidence that refraction can still occur.

tan-1(MUs)= critical angle

The behaviour of electromagnetic waves of depends on their wavelengths. As a result the critical angle for refraction changes according to the wavelength.

because a smaller critical angle means that it is easier for total internal reflection to occur, which is the desirable quality in an optical fibre.

They remain the same.

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It spells "critical" correctly

totally internally diffracted.

The refractive number of a substance is a measure of how much the speed of a wave changes compared to the speed in a reference medium i.e. air or a vacuum. The critical angle is the angle of incidence above which total internal reflection occurs. When the angle of incidence of the light ray leaving the glass is less than the critical angle, the light ray speeds up on leaving the glass and is refracted away from the normal.

The critical angle is given by the formula: Thetac = sin-1(n2/n1) Assuming a diamond-air boundary, this gives the critical angle as: Thetac = sin-1(1.00/2.42) = 24.4 degrees.

Total Internal Reflection is an optical phenomenon which occurs when a ray of light strikes a medium boundary at an angle larger than a particular critical angle with respect to the normal to the surface. If the refractive index is lower on the other side of the boundary, no light can pass through and all of the light is reflected. The critical angle is the angle of incidence above which the total internal reflection occurs. Hope I helped!

It will bounce at the same angle that it came. \ / \__/

It is reflected at the same angle it hit the mirror at

Total internal reflection occurs when the angle of incidence with respect to the normal at the boundary to a less dense medium exceeds the critical angle.

The critical angle depends on the index of refraction of the two substances, in this case, air and glass. The angle can be calculated by Snell's Law. It won't always be exactly 39.3Â°, since different glasses have different indices of refraction.

It is reflected at an opposite angle, and focused by the lens.

The Critical angle of perspex is 42o.It is the same as the critical angle of glass.

Radiation that strikes the interface parallel to the normal, i.e. perpendicular to the boundary, is not refracted.