What do you understand by refraction of light?
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The change in direction of path of light when it passes from one optically transparent medium to another is called refraction of light.
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Which is optically denser: water or air? Give reason.
Out of air and glass, which is optically rarer? Give reason.
Define the following terms:
(a) Incident ray
(b) Refracted ray
(c) Angle of incidence
(d) Angle of refraction
A ray of light falls normally on a glass slab. What is the angle of incidence?