Q29 of 284 Page 229

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


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.

(i) Example of a medium pair so that light speeds up when it goes from one of these medium to another is Crown glass to water

(ii) Example of A medium pair so that light slows down when it goes from one of these medium to another is Water to diamond


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27

Refractive indices of water, sulphuric acid, glass and carbon disulphide are 1.33, 1.43, 1.53 and 1.63 respectively. The light travels slowest in:

 28

The refractive index of glass with respect to air is 3/2 and the refractive index of water with respect to air is 4/3. The refractive index of glass with respect to water will be

 30

Refractive indices of four media A, B, C and Dare given below:


In which of these four media is the speed of light (i) maximum, and (ii) minimum ?

 1

Name the lens which can concentrate sun's rays to a point and bum a hole in a piece of paper.