In your laboratory, you trace the path of light rays through a glass slab for different values of angle of incidence () and in each case measure the values of the corresponding angle of refraction ($\angle r$) and angle of emergence ($\angle e$). On the basis of your observations your correct conclusion is:(a) $\angle i$ is more than $\angle r$

(a) Ði is more than Ðr , but nearly equal to Ðe

Explanation  

As the light rays travel from the rarer to denser medium it always bends towards normal as shown in the figure given below.

So, on entering the glass slab (denser medium) from the air (rarer medium), the incident light gets refracted and bends towards the normal making the angle of incidence greater than the angle of refraction.

Thus, $\angle i>\angle r$.

Also, in refraction of light through a glass slab, the emergent ray is parallel to the incident ray. Thus, $\angle i=\angle e$.

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Updated on: 10-Oct-2022

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