Q30 of 284 Page 229

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 ?

(i) Speed of light is maximum in A as it has least refractive index.

(ii) Speed of light is minimum in D as it has highest refractive index.


More from this chapter

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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

 29

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.

 1

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

 2

Give the usual name for the following :

A point inside a lens through which the light passes undeviated.