Question
Explain the phenomena of the total internal reflection in right angle prism and the image formed by it.
✓
Answer
→A prism usually has a refractive index of 1.5 giving a corresponding critical angle of $42^{\circ}$.
→As shown in figure (a) a ray of light is deflected by $90^{\circ}$ and thereby produces an image $A ^{\prime} B ^{\prime}$ of an object $A B$.
→As shown in figure (b), a ray of light is deflected by $180^{\circ}$ and an inverted image $A ^{\prime} B ^{\prime}$ is obtained of the object AB .
→As shown in figure (c) such a prism is also used to invert images without changing their size.
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