Question

What are the apparatus that are required to prove the laws of reflection?
A.A spherical mirror
B.A plane mirror, a laser light, a pencil, a protractor
C.A mirror with black paper
D.A ray of light

Answer 1

Hint: The laws of reflection are
1.The incident ray, the reflected ray and the normal to the reflecting surface at a point of incidence lie in the same plane
2. The angle of incidence will be equal to the angle of reflection $\angle i = \angle r$

Complete step by step answer:
The laws of reflection are
1.The incident ray, the reflected ray and the normal to the reflecting surface at a point of incidence lie in the same plane
2. The angle of incidence will be equal to the angle of reflection $\angle i = \angle r$
To prove the laws of reflection we can do the following experiment. Allow a ray of laser light to fall on a plane mirror kept vertically on a paper. Using a Pencil mark the path of the incident light, reflected light , point of incidence and base of the mirror. Draw a line perpendicular to the mirror at the point of incidence. Using a protractor measure the angle between the incident ray and the normal. This gives the angle of incidence and the angle between the reflected ray and the normal gives the angle of refraction.
We can find that the angle of incidence and angle of reflection will be equal. And incident ray reflected ray and the normal lie in the same plane.

Thus, the correct option is option B.

Note:
While measuring the angle of incidence make sure the angle is measured from incident ray till the normal. Normal is the line drawn perpendicular to the surface of the mirror at the point of incidence. Similarly, while measuring the angle of reflection measure the angle from the normal to the refracted ray.