The drawing shows a horizontal ray of white light incident perpendicularly on the vertical face of a prism (crown glass). The light enters the prism, and part of it undergoes refraction at the slanted face and emerges into the surrounding material. The rest of it is totally internally reflected and exits through the horizontal base of the prism. The colors of light that emerge from the slanted face may be chosen by altering the index of refraction of the material surrounding the prism. Find the required index of refraction of the surrounding material so that
(a) Only red light and
(b) All colors except violet emerge from the slanted face. (See Table 26.2.)

Transcribed Image Text:

45.00° 90.00° Table 26.2 Indices of Refractionn of Crown Glass at VariouS Wavelengths Vacuum Index of Wavelength Refraction, Color nm Red Orange Yellow Green Blue Violet 660 610 580 550 470 410 1.520 1.522 1.523 1.526 1531 1.538 Approximate