Nt1310 Unit 7

CHAPTER 5: LIGHT

In each of the following sentences, fill in the bracket the appropriate word or words given below.

solid, liquid, gas, vacuum, electromagnetic wave, energy

1. Light is a form of ( ).
2. It travels in the form of ( )
3. In can travel through ( )
4. It travels fastest in the medium of ( )
5. Light of different colours travels at the same speed in the medium of ( )

Light allows us to see objects.
Light can be reflected or refracted.

1. UNDERSTANDING REFLECTION OF LIGHT

Plane mirror and reflection: In the boxes provided for the diagram below, write the name of each of
Curved Mirrors:
[pic]
Terminology: Refer to the diagrams above and give the names for the following:
[pic]

Effect of curved mirrors on incident rays:

a) Incident rays parallel to the principal axis:
[pic]

Study the diagrams above and fill in the blanks for the following sentences.
[pic]
r = 2f

b) Incident rays parallel to each other but not parallel to the principal axis:

[pic]

Study the diagrams above and fill in the blanks in the following sentences.

▪ Parallel rays converge at a point called ……………………………

▪ The ray passing through C is reflected back along the line of the…………………….ray.

▪ The distance between the focal plane and the mirror is the ………………………….,f.

Image formed by curved mirror (ray diagram method)

Principle of drawing ray diagrams:

a. Rays parallel to the principal axis are reflected through the principal focus, F.

[pic]

Exercise 1: Complete the ray diagrams below: