Worksheet 5.1 Understanding Reflection of Light

1. Figure 1 shows a pencil placed in front of a plane mirror.

Figure 1(a) In figure 1, draw two light rays from P and show how an observer sees the image of the pencil.

(b) State the characteristics of the image formed.

……………………………………………………………………………………………………..

……………………………………………………………………………………………………..

(c) Figure 2 shows the plane mirror is being rotated 5o clockwise about the point R.

In figure 2, complete a ray diagram to show how the image of the pencil is formed.

(d) State the changes that will happen to the image if(i) the plane mirror is moved away from the object.

……………………………………………………………………………………………………

(ii) the mirror is rotated clockwise through a small angle.

……………………………………………………………………………………………………

observer

pencilP

Plane mirror

R

observer

pencilP

Plane mirror

R

Upright, virtual, laterally inverted, same size as the object

Image will move away from the mirror

Image will move down

2. Draw the ray diagram to produce an image formed by each mirror and state the characteristics of the image.

Object distance, u

Convex mirror Concave mirror

u > CP

Characteristics

u = CP

Characteristics

f < u < CP

Characteristics

u = f

Characteristics

u< f

Characteristics

P F CO C F P

O

P F CO C F P

O

P F CO C F P

O

P F CO C F P

O

P F CO

C F P

O