Question

a) Find the velocity of light in crown glass?
b) Find the medium with lowest optical density?
c) You are given crown glass and rubyin which of these does light travel fastest?
d) In which of these mediums mentioned in the table does the light travel fastest?​

Answer 1

Answer:

Ans a)The speed of light in crown glass is 1.67*10^8.

Ans b)A medium which has the highest refractive index will have the highest optical density and vice-versa. It can be observed from table 10.3 that diamond and air respectively have the highest and lowest refractive index. Therefore, diamond has the highest optical density and air has the lowest optical density.

Ans c)A ray of light travelling in water is incident on its surface open to air. The angle of incidence is θ, which is less than the critical angle. Then there will be,

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Ans d)We know from the definition of refractive index, that the speed of light is higher in a medium with lower refractive index. So, the light travels fastest in water relative to kerosene and turpentine.