Q3 of 8 Page 79

Mark the correct answer in the following questions.

We can see the Sun even when it is little below the horizon because of

During sunrise when sun is little below horizon the light rays move through different refractive indices of air and get bends towards the normal undergoing refraction so we see the apparent position of the sun S’. Thus even though the sun is below the horizon we can see the sunrise.


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2

Prove the following statements.

A rainbow is the combined effect of the refraction, dispersion, and total internal reflection of light.

 3

Mark the correct answer in the following questions.

What is the reason for the twinkling of stars?

 3

Mark the correct answer in the following questions.

If the refractive index of glass with respect to air is 3/2, what is the refractive index of air with respect to glass?

 4

Solve the following examples.

If the speed of light in a medium is 1.5 x 108 m/s, what is the absolute refractive index of the medium?