Question

Total reflecting prism is used for

• A. deviating a ray of light through ${180}^{\circ }$
• B. deviating a ray of light through ${90}^{\circ }$
• C. obtaining the invented image without producing deviation in its path
• D. all of these

Answer 1

The correct option is D all of these

A prism having an angle of ${90}^{\circ }$ between its two refracting surfaces and the other two angles each equal to ${45}^{\circ }$ is called total reflecting prism because the light incident normally on any of the faces, suffers total internal reflection inside the prism. Due to this behaviour, a total reflecting prism is used for the above three purposes.