'O' Level Standard Questions - RefractionQ5. Two faces of a glass prism with a refractive index of 1.50 have an angle of 40° between them. A ray of light is incident on one of the faces at an angle of 45°. Trace the path of the ray through the prism and find the angle between the direction of the ray entering the prism and the direction of the ray leaving the prism.
nairsin θair = nglasssin θglass 1 x sin 45o = 1.50 x sin θglass sin θglass= sin 45o/1.50 = 0.471 θglass= 28o We now need to calculate a few angles.... nairsin = nglasssin θglass sin θair= 1.50 x sin 12o sin θair= 0.312 θair= 18o
Therefore the ray changes direction by 23o
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