REFLECTION
What happens to light when it hits a mirror?
It is reflected.
What is refraction?
The bending of light when it passes from one medium to another.
What natural object helps form a rainbow?
Raindrops.
What colour do we see if all colours of light combine?
White.
What is a galaxy?
A large group of stars, gas, and dust held together by gravity.
State the law of reflection.
Angle of incidence = angle of reflection.
Does light travel faster in air or in glass?
Air.
What happens to white light in a rainbow?
It is split into different colours.
What are the three primary colours of light?
Red, Green, Blue.
What galaxy do we live in?
The Milky Way.
What is the normal?
An imaginary line drawn at 90° to the surface.
What happens to light when it moves from air into water?
It slows down and bends.
What process causes white light to separate into colours?
Dispersion.
What colour is formed when red and green light mix?
Yellow.
What is an asteroid?
A small rocky object orbiting the Sun.
What type of surface produces clear images?
Smooth, shiny surfaces.
If light enters a denser medium, does it bend toward or away from the normal?
Toward the normal.
Name the colour at the top (outer edge) of a rainbow.
Red.
Why does a blue object look blue?
It reflects blue light and absorbs other colours.
What is the difference between a comet and an asteroid?
A comet contains ice and forms a tail near the Sun; an asteroid is mostly rock.
Why does a rough surface not produce a clear image?
Because light is reflected in many directions (scattered).
Why does an object under water appear closer to the surface than it really is?
Because light bends when it leaves the water.
Why do we only see a rainbow when the Sun is behind us?
Because sunlight must enter raindrops and reflect toward our eyes.
What happens to an object’s colour in a dark room?
It appears black because no light is reflected.
What is a meteor?
A rock from space that burns up in Earth’s atmosphere.