Question

Determine the refractive index of benzene if the critical angle of pencil with respect to air is 42 degrees

Answer 1

Answer:

Light travels different speeds in different media depend upon the densities of the

substances.

When light rays travel from rare medium to denser medium it bends towards the

normal. If the light rays travels from denser to rarer medium it bends away from the normal.

Speed of light is maximum in vacuum. It travels with a speed of 3×108

m/s. When it

propagates in any medium its velocity is less than 3×108

m/s. The ratio of these two

velocities is constant. The constant is called “refraction index” (n).

Snell’s law is relation between incident angle (i) to the refracted angle (r)

i.e. n1 sin i = n2 sin r.

When light travels from denser medium to rare medium, at a particular incident angle

i.e. angle more than the critical angle the total interval reflection takes places. To internal

reflection is a phenomenon behind mirage and shining of diamond.

Answer 2

Explanation:

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