Question

Explain the use of a totally reflecting prism.​

Answer 1

Explanation:

A prism is used to break light up into its constituent spectral colors (the colors of the rainbow). Prisms can also be used to reflect light, or to split light into components with different polarizations

Answer 2

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The critical angle for crown glass - air is interface is about 41.2°. If a ray of light is con incident on the interface through glass at anbangle greater than this, the ray is totally internally reflected. The simplest type of a totally reflecting prism is a right prism (45° - 45° - 90°). A ray of light may be internally reflected only once at the hypotenuse, or may enter and leave through the hypotenuse after undergoing two internal reflections,In each case, if the ray enters one face of the prism normally, the angle of incidence at the glass-to- air interface is 45°, i.e., greater than the critical angle.

Two such prisms are used in a periscope (each prism turning the ray by 90°) and a prism binocular (each prism turning the ray by 180°).