YEAR-8 PHYSICS CET.
Name……………………………
1. A plane mirror is a type of mirror.
Which of these words describe the meaning of plane?
flat
irregular
round
smooth
rough
Ans: _______________________________________
2. Complete the sentence that describes how light is reflected from a plane mirror.
The angle of reflection is __________________ to the angle of __________________.
3. Complete the diagram to show how light is reflected from the plane mirror.
All labels are needed. The angles are must be equal.
normal
plane mirror
4. Complete each of these sentences with either the words ‘speed up’ or the words ‘slow down’.
a. When light passes from air into glass, the light ____________________________.
b. When light passes from air into water, the light____________________________.
c. When light passes from glass into air, the light ____________________________.
5. Complete these ray diagrams to show what happened to the light rays.
On each diagram, draw and label:



The normal
The refracted ray
The angles of incidence and refraction.
a.
air
glass
b.
air
water
6. A theater uses coloured lights to make objects appear different.
Write the colors that each of these objects will appear.
a. A red book in white light.
____________________
b. A green door in green light.
____________________
c. A white T-shirt in blue light. ____________________
d. A blue ball in green light.
____________________
7. List the four things that make up a galaxy.
_____________________________________________________________
8. Name the galaxy that contains the Earth.
_____________________________________________________________