Question

Describe the path into a prism and out of a prism when a ray of light is incident at 90° to the hypotenuse of a right angled glass prism

Answer 1

Refer to the provided attachment.

Question

Describe the path into a prism and out of a prism when a ray of light is incident at 90° to the hypotenuse of a right angled glass prism

Explanation

Let us suppose an incident ray AB strikes a prism PQR normally or perpendicularly to its hypotenuse PR as shown above. Since, the ray strikes normally ( 90° ) it will not deviate from its initial path but on striking the side PQ making an angle less than 90° it suffers a refraction and will bend away from the normal as shown CD after emerging out since the media is rarer i.e air media is rarer than glass media.

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Note that

In the above diagram Notation stands for

$\begin{array}{|c|c|c|} \hline \rm \: AB& \rm \: Incident \: ray \\ \hline \rm \: BC& \rm \: Refracted \: ray \\ \hline\rm \: CD & \rm \: Emergence \: ray\end{array}$

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