Laws of Reflection

Q.

What are the laws of reflection?

Q.

How does light travel in a straight line?

Q.

What is the angle of incidence of a ray if the reflected ray is at an angle of 90 degree to the incident ray?

Q.

(a) Draw a diagram to show the reflection of light from a plane mirror.Label the following on the diagram:

(a) Plane mirror (b) Incident ray (c) Reflected ray

(d) Point of incidence (e) Normal (f) Angle of incidence

(g) Angle of reflection

(b) State the laws of reflection of light.

Q. What is the angle of reflection when a ray of light is incident normally on a reflecting surface?

1. $0^{\circ }$
2. ${45}^{\circ }$
3. ${60}^{\circ }$
4. ${90}^{\circ }$

Q. The laws of reflection hold good for:

1. Concave mirror only
2. Plane mirror only
3. Convex mirror only
4. All mirrors irrespective of their shapes

Q.

What is the angle of reflection when a ray of light is incident normally on a plane mirror?

Q. A ray incident on a plane mirror is reflected in a direction such that the angle between the incident and the reflected ray is 90 degree. What are the angles of incidence and reflection?

Q.

What happens when a ray of light is incident on a plane mirror at an angle of ${30}^{\circ }$.

Q.

What is the angle of incidence when a ray of light is incident normally on a plane mirror?

Q.

An incident ray makes an angle of ${65}^{\circ }$ with the surface of a plane mirror. The angle of reflection in this case will be:

(a) ${65}^{\circ }$

(b) ${45}^{\circ }$

(c) ${25}^{\circ }$

(d) ${35}^{\circ }$

Q.

Question 07
Angle of incidence is equal to the angle of reflection.
a. Always
b. Sometimes
c. Under special circumstances
d. Never

Q. A light ray is incident perpendicular to the plane mirror. What is the angle of incidence and the angle of reflection respectively?

1. ${90}^{\circ },{180}^{\circ }$
2. ${90}^{\circ },{180}^{\circ }$
3. $0^{\circ },0^{\circ }$
4. $0^{\circ },{90}^{\circ }$

Q.

Ceilings of concert hall are curved. Why?

Q. The bouncing back of light after hitting a shiny surface is called ___________ of light.

1. reflection
2. bending
3. refraction
4. diffraction

Q. A light ray strikes a mirror normally. What is the angle of reflection?

1. ${45}^{\circ }$
2. ${180}^{\circ }$
3. ${90}^{\circ }$
4. $0^{\circ }$

Q. The incident ray, the reflected ray and the normal to the mirror at the point of incidence lie in ____________.

1. straight line
2. mutually perpendicular planes
3. the same plane
4. different planes

Q.

A ray of light is incident normally (perpendicularly) on a plane mirror. Where will this ray of light go after reflection from the mirror?

Q.

For total internal reflection to occur, incidence angle must be greater than the critical angle.

1. True

2. False

Q.

Define the angle of incidence.

Q.

If the angle between the incident ray and the reflected ray is ${70}^{\circ }$, what is the angle of incidence?

1. ${90}^{\circ }$

2. ${35}^{\circ }$

3. $0^{\circ }$

4. ${45}^{\circ }$

Q.

The incident ray, the reflected ray and the normal, all lie in a same plane.

1. 30 cm

2. 60 cm

Q.

The angle of incidence and angle of reflection are equal only if the incident ray and the reflected ray are in the same plane and the normal is in a different plane.

1. True
2. False

Q. A light ray is incident at an angle of 60° on the mirror A which is placed at a right angle to a mirror B as shown in figure. Find the angle of reflection for the ray reflected from mirror B.

1. 90°
2. 60°
3. 30°
4. 45°

Q.

Which of the following is not a characteristic of image formed by a plane mirror?

1. Image is laterally inverted

2. Image can be obtained on a screen

3. Erect image is formed

4. Image formed is of the same size as the object

Q.

What do you understand by the term 'point of incidence'?

Q. Question 13
What is the angle of incidence of a ray if the reflected ray is at an angle of 90° to the incident ray?

Q.

An incident ray makes an angle of ${75}^{\circ }$ with the surface of a plane mirror. What will be the angle of reflection?

Q. State the two laws of reflection?

Q.

The size of the image formed by the convex mirror is ________.