A light ray in passing from water to a medium (a) speeds up, (b) slows down. In each case, (i) give one example of the medium, (ii) state whether the refractive index of medium is equal to, less than or greater than the refractive index of water.

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Solution

(a) Air (its refractive index is less than that of water)
(b) Glass (its refractive index is more than that of water)

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A light ray enters from medium A to medium B as shown in figure. The refractive index of medium B relative to A will be:

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Q. The following table gives the refractive indices of a few media:

	1	2	3	4	5
Medium :	Water	Crown glass	Rock salt	Ruby	Diamond
Refractive index :	1.33	1.52	1.54	1.71	2.42

Use this table to give an example of:

(i) a medium pair so that light speeds up when it goes from one of these medium to another.
(ii) a medium pair so that light slows down when it goes from one of these medium to another.

The following table gives the refractive indices of a few media : $\begin{matrix} 1 & 2 & 3 & 4 & 5 M e d i u m : & W a t e r & C r o w n g l a s s & R o c k s a l t & R u b y & D i a m o n d R e f r e a c t i v e i n d e x : & 1.33 & 1.52 & 1.54 & 1.71 & 2.42 \end{matrix}$

Use this table to give an example of : (i) a medium pair so that light speeds up when it goes from one of these medium to another. (it) a medium pair so that light slows down when it goes from one of these medium to another.

Q. A ray of light passes from a medium