8/11/2019 Refraction Worksheet

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8/11/2019 Refraction Worksheet

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1". 4he diagram at the right shows a ra$ of light traveling through air towards a thin la$er of linseed oiln 1.5"3 resting on to0 of water n1.##3.

4he light ra$ a00roaches the linseed oil at an angle of incidence of %8.2.

a. etermine the angle of refraction at the air-linseed oil boundar$.

b. etermine the angle of refraction at the linseed oil-water boundar$.

11. & glass cube is held in contact with a liquid and a light ra$ is directed at a vertical face

of the cube. 4he angle of incidence at the vertical face is then decreased to %2? as

shown in igure.

&t this 0oint the angle of refraction is 2*? and the ra$ is totall$ internall$ reflected at @ for the first time.

a3 om0lete igure 8 to show the 0ath of the ra$ be$ond @ until it returns to air.

b3 +how that the refractive inde7 of the glass is about 1. 5.

c3 alculate the critical angle for the glass-liquid boundar$.

d3 alculate the refractive inde7 of the liquid.