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Standard X

Physics

Total Internal Reflection

In Fig, PQ ...

Question

In Fig, $P Q$ and $P R$ are the two light rays emerging from an object $P$ . The ray $P Q$ is refracted as $Q S$ . The ray $P R$ suffers partial reflection and refraction on the water-air interface. This is because :

the angle of incidence is more than the critical angle

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the angle of incidence is equal to the critical angle

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the angle of incidence is less than the critical angle

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the angle of incidence is

90^{o}

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Solution

The correct option is C the angle of incidence is less than the critical angle
$P R$ ray has angle of incidence less than critical angle, hence it will undergo refraction (with the refracted ray bending away from the normal) and partial reflection.

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Similar questions

In Fig. 4.63, PQ and PR are the two light rays emerging from an object P. The ray PQ is refracted as QS.

(a) State the special name given to the angle of incidence $∠ P Q N$ of the ray PQ.

(b) What is the angle of refraction for the refracted ray QS?

(d) The ray PR suffers partial reflection and refraction on the water-air surface. Give reason.

(e) Draw in the diagram the refracted ray for the incident ray PR and hence show the position of image of the object P by the letter P' when seen vertically from above.

Q. In Fig,

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are the two light rays emerging from an object

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. State the special name given to the angle of incidence

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of the ray

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PQ (Double arrow ray) and PR (Single arrow ray) are two light rays emerging from the object P as shown in the figure below:

Name the phenomenon that occurs if the angle of incidence (angle PQN) is increased still further.

Q. A ray

R_{1}

is incident on the plane surface of the glass slab (kept in air) of refractive index

\sqrt{2}

at an angle of incidence equal to the critical angle for this air glass system. The refracted ray

R_{2}

undergoes partial reflection and refraction at the other surface. The angle between reflected ray

R_{3}

and the refracted ray

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at that surface is :

Q. A ray of light from denser medium strikes a rarer medium at angle of incidence

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. The critical angle is

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In Fig, PQ and PR are the two light rays emerging from an object P. The ray PQ is refracted as QS. The ray PR suffers partial reflection and refraction on the water-air interface. This is because :

The correct option is C the angle of incidence is less than the critical anglePR ray has angle of incidence less than critical angle, hence it will undergo refraction (with the refracted ray bending away from the normal) and partial reflection.

In Fig, $P Q$ and $P R$ are the two light rays emerging from an object $P$ . The ray $P Q$ is refracted as $Q S$ . The ray $P R$ suffers partial reflection and refraction on the water-air interface. This is because :

The correct option is C the angle of incidence is less than the critical angle
$P R$ ray has angle of incidence less than critical angle, hence it will undergo refraction (with the refracted ray bending away from the normal) and partial reflection.