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Fermat's Theorem

A beam of lig...

Question

A beam of light travelling in air is incident on water. Draw a ray-diagram indicating the change in its path in water.

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Solution

When a beam of light travelling in air enters water, it bends towards the normal.

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Q. Question 29
Draw a ray diagram showing the path of rays of light when it enters with oblique incidence (i) from air into water; (ii) from water into air.

Q. A ray of light travelling in air is incident on a rectangular glass block and emerges out into the air from the opposite face. Draw a labelled ray diagram to show the completer path of this ray of light. Mark the two points where the refraction of light takes place. What can you say about the final direction of ray of light?

Q. A ray of light from air is incident in water; then which property of light will not change in water?

Q. The velocity of light in water is

2.25 \times 10^{8} m s^{- 1}

. A ray of light travelling in air is incident on an air water interface at angle of incidence of

30^{0}

. Calculate the angle of refraction. Find also the angle of deviation.

Q. A ray of light travelling in water is incident on its surface open to air. The angle of incidence

θ,

which is less than the critical angle. Then there will be:

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