Reflection

Question 1

What is reflection

Answer 1

When a Ray of light approaches a smooth polished surface and the light Ray bounces back..

Question 2

State the laws of reflection

Answer 2

1. The incident Ray, the normal, and the reflected Ray at the point of incidence all lie in the same plane.
2. The angle of incidence is equal to the angle of reflection.

Question 3

Give 5 characteristics of images formed on a plane mirror

Answer 3

1. The image formed is the same size as the object
2. Image formed is laterally inverted
3. Image formed is virtual
4. Image formed is upright
5. Images formed are as far behind the mirror as the object is in the front.

Question 4

Lateral inversion occurs when…

Answer 4

An object is perpendicularly opposite its image behind the plane mirror.

Question 5

When two plane mirrors are inclined at right-angle to each other, how many images are formed

Answer 5

3 images are formed.

Question 6

When two plane mirrors are placed parallel to each other, how many images are formed..

Answer 6

Infinite number of images are formed.

Question 7

What are the applications of the plane mirror

Answer 7

Periscope
Kaleidoscope
Mirror galvanometer and sextant

Question 8

In periscope, the angle of inclination of the 2 plane mirrors is at a angle of..

Answer 8

45°

Question 9

In the Kaleidoscope, the angle of inclination of the 2 plane mirrors is at an angle of

Answer 9

60°

Question 10

The centre or midpoint of a curved mirror is called

Answer 10

Pole(P)

Question 11

The centre of the sphere of which the mirror forms path is called

Answer 11

Centre of curvature (C)

Question 12

The line PC, from the pole to the centre of curvature, is called

Answer 12

Principal Axis

Question 13

The distance between the pole and the principal axis is called

Answer 13

Focal length.
It can be expressed as F=r÷2

Question 14

The radius at which the sphere was cut is called

Answer 14

Radius of curvature (r)

Question 15

Image is virtual when the value of v is

Answer 15

Negative

Question 16

When the object is placed far from the center of curvature (C)

Answer 16

The image is real, inverted, and diminished.

Question 17

When object is placed at the centre of curvature

Answer 17

The image is real, inverted and the same size as the object.

Question 18

When the object is placed between the centre of curvature and the principal focus,the image is..

Answer 18

Real, inverted and magnified.