Show that no ray can pass through a prism whose refracting angle A is greater than twice the critical angle for the material of the prism.
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Angle of refraction is the angle between the refracted ray and the normal.
Angle of refraction is less than 90°. When angle of refraction is 90° the angle of incidence is called critical angle.
At any angle of incidence greater than critical angle the light cannot pass through the surface and thus it is reflected.
This is called total internal reflection.
It is called :
Total because all the light energy is reflected.
Internal because light energy stays inside the material.
Reflection coz light is reflected.
Find diagram in the images below.
Angle of refraction is less than 90°. When angle of refraction is 90° the angle of incidence is called critical angle.
At any angle of incidence greater than critical angle the light cannot pass through the surface and thus it is reflected.
This is called total internal reflection.
It is called :
Total because all the light energy is reflected.
Internal because light energy stays inside the material.
Reflection coz light is reflected.
Find diagram in the images below.
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