Question

When the angle of reflection is ${40}^{\circ }$, then the angle between normal and the mirror will be

• A. ${40}^{\circ }$
• B. ${90}^{\circ }$
• C. ${45}^{\circ }$
• D. ${60}^{\circ }$

Answer 1

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

Normal is always perpendicular to the mirror, irrespective of the angle of incidence and the angle of reflection. So normal always makes an angle of ${90}^{\circ }$ with the mirror (reflecting surface).