Science Y 3-4 How a Projector Works

What does a projector use to show the picture on the screen?

• Light

• Air

• Power

What changes the small pictures into bigger pictures to shine on the screen?

• A lens

• A switch

• A bulb

What is this called?

• A film strip

• A film pattern

• A film projection

Light shines through the lens before reaching the screen.

• True

• False

The light bulb in the projector gets very hot.

• True

• False

The film strip in the projector can become very hot and ________ if it stops moving.

• melt

• break

Does the light from the projector get stronger or weaker as it reaches the screen?

• Stronger

• Weaker

Why do we watch movies in the dark?

• With other lights on the picture is hard to see

• With the image getting smaller we need the dark

• With the image getting bigger we need the dark

A movie projector uses 2 types of energy: ____ and _____ energy.

• water,light

• light, heat

• heat,sound

If we adjust the lens , what does it do to the picture on the screen?

• It will focus the picture

• It will make the picture bigger

• It will make the picture move faster