Question

For a ray, incident at an angle of ${45}^{\circ }$ on a plane mirror the deviation produced in its path will be

• A. ${45}^{\circ }$
• B. ${90}^{\circ }$
• C. ${120}^{\circ }$
• D. ${150}^{\circ }$

Answer 1

The correct option is B ${90}^{\circ }$

$\delta =180-2i\delta =180-2\left({45}^{\circ }\right)=180-90={90}^{\circ }$