Question

QUESTIONS
Any of light travelling in air enters obliquely into water. Does the light
ray bend towards the normal or away from the normal? Why?
Light enters from air to glass having refractive index 1.50. What is the
speed of light in the glass? The speed of lighi in vacuum is 3 x 10 ins
Find out from Table 10.3. the medium having highest optical density
Also in the medium with lowest optical density
You are given kerosene, turpentine and water in which of these does
the light tuve fastesi? Use the information given in Table 10.3.
The refractive index of duvand is 2.0,What is the meaning of this
statement?​

Answer 1

Answer:

Light bends towards the normal in water because the ray is travelling from a rarer medium to denser medium.

Refractive index of a medium, nm = Speed of light in vacuum/Speed of light in the medium

Speed of light in vacuum, c = 3 × 108 ms-1

Refractive index of glass, ng = 1.50

Speed of light in the glass, v = Speed of light in vacuum/ Refractive index of glass

= c/ng

=3 × 108/1.50 = 2x 108 ms-1.

Optically denser medium from the table 10.3 is diamond and the optically rarer medium is air.

Water travels faster because it has least refractive index.

Light travels 2.42 times faster in vaccum than in diamond.

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