Page 4 - 10-phy-12 Geometrical Optics

5. A ray travels from water to air at an angle of 40° with the normal. Find
the angle of refraction in the air if the refractive index of water is 1.33.
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6. When you look at reflection in a sheet of glass, you often see a
double image. Why?
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BRAIN TEASER
1. Why does a stick immersed obliquely in water appear to be bent or

short? Explain with the help of a ray diagram.
2. Why do faces of the persons sitting opposite to you around a camp fire

appear to shimmer?

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