A student traces the path of a ray of light passing through a rectangular glass slab and marks the angle of incidence i, angle of refraction r and angle of emergence e, as shown. The correctly marked angle(s) is /are:

< i

only

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< e

only

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< r

only

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< i

and

< e

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Solution

The correct option is A $< r$ only
Angle of incidence, angle of refraction and angle of emergence, all are measured from the normal to the surface. Therefore, only angle of refraction, $< r$ is marked correctly.
Hence,the correct option is $C$ .

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A student traces the path of a ray of light passing through a rectangular glass slab and marks the angle of incidence i, angle of refraction r and angle of emergence e, as shown. The correctly marked angle(s) is /are:

The correct option is A <r onlyAngle of incidence, angle of refraction and angle of emergence, all are measured from the normal to the surface. Therefore, only angle of refraction, < r is marked correctly.Hence,the correct option is C.

The correct option is A $< r$ only
Angle of incidence, angle of refraction and angle of emergence, all are measured from the normal to the surface. Therefore, only angle of refraction, $< r$ is marked correctly.
Hence,the correct option is $C$ .