The path along which light travels in a homogenous medium is called the :

Which of the following correctly represents graphical relation between angle of incidence (i) and angle of reflection (r) ?

When a ray of light enters a transparent medium it undergoes change is :

A convex mirror of focal length f (in air) is immersed in a liquid (μ = 4). The focal length of the mirror in 3 liquid will be :

Air is not visible because it _

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