Question

1. Which of the following statements are true for a plane mirror ? D) angle of incidence = angle of reflection ii) angle of deviation d=180-2 i iii) for normal incidence d = 180° a) only i b) only ii c) both ii and iii d) all​

Answer 1

Answer:

2 plz mark as brainlist answer

Answer 2

d) All statements are true.

Reflection from plane mirror:

1. Law of reflection states: "The angle at which a ray is incident on a mirror is equal to the angle at which that ray reflects back in the same medium".
2. Deviation angle is the angle made by reflected ray with the direction of incident ray behind the mirror.
3. So, deviation angle = 180° - (angle of reflection + angle of incidence) = 180° - (r + i) = 180° - 2i
4. For normal incidence, angle of incidence is zero and so the angle of reflection is also zero. Hence, 180° - (0° + 0°) = 180°