Absorption of Light

Q. Two plane mirrors are arranged at right angles to each other. A ray of light is incident on the horizontal mirror at an angle $\theta$. For what value of $\theta$, the ray emerges parallel to the incoming ray after reflection from the vertical mirror?

1. ${60}^{\circ }$
2. ${30}^{\circ }$
3. ${45}^{\circ }$
4. All of the above

Q.

The angle between the refracted ray and the normal is called the angle of incidence.

1. True
2. False

Q. A light ray interacts with the matter around in several ways. Which of the following are the correct observations?

1. a ray of light bends when it enters from one medium to another
2. a ray of light bounces off a surface in such a way that the incident ray, normal and the reflected ray are in the same plane
3. a ray of light after striking some surfaces, gets absorbed by them
4. A ray of light doesn’t follow the property of rectilinear propagation in a medium other than vacuum

Q.

Finger prints on a piece of paper may be detected by sprinkling fluorescent

powder on the paper and then looking it into [MP PET/PMT 1988]

1. Mercury light

2. Sunlight

3. Infrared light

4. Ultraviolet light

Q. Two plane mirrors are arranged at right angles to each other. A ray of light is incident on the horizontal mirror at an angle $\theta$. For what value of $\theta$, the ray emerges parallel to the incoming ray after reflection from the vertical mirror?

1. ${60}^{\circ }$
2. ${30}^{\circ }$
3. ${45}^{\circ }$
4. All of the above

Q. Two plane mirrors are arranged at right angles to each other. A ray of light is incident on the horizontal mirror at an angle $\theta$. For what value of $\theta$, the ray emerges parallel to the incoming ray after reflection from the vertical mirror?

1. ${60}^{\circ }$
2. ${30}^{\circ }$
3. ${45}^{\circ }$
4. All of the above