01. Question:
Define reflection of light.
Answer:
The phenomenon by which a ray of light changes the direction of propagation when it strikes a boundary between different media through which it cannot pass is described as the reflection of light.
2. Question:
Name the two types of reflection.
Answer:
The two types of reflection are regular reflection and irregular or diffused reflection.
3. Question:
What is meant by diffused reflection?
Answer:
In this type of reflection the different portions of the surface reflect the incident light in different directions and no definite image is formed but the surface becomes visible.
4. Question:
Name the phenomenon due to which we see the non-luminous objects.
Answer:
It is due to diffused or irregular reflection of light that we see the non-luminous objects.
5. Question:
While looking at your image in a large plane mirror, if you touch your left ear it appears as if your image has touched the right ear. Why?
Answer:
It is due to lateral inversion that we feel that the image has touched the right ear.
6. Question:
Name any one device based upon the principle of reflection of light by plane mirrors.
Answer:
Periscope is a device based on the principle of reflection of light.
7. Question:
Define magnification.
Answer:
The ratio of the height of the image to the height of the object is called the linear magnification.
8. Question:
What type of surface causes regular reflection?
Answer:
Smooth polished surfaces cause regular reflection.
9. Question:
Define a) Centre of curvature b) Pole of a spherical mirror
Answer:
Centre of curvature is the centre of the sphere of which the spherical mirror forms a part. Pole of a mirror is the midpoint of the aperture of the spherical mirror.
10. Question:
What kind of mirror is used in a car to view the traffic behind it?
Answer:
Convex mirror is used in a car to view the traffic behind it.
