Light

why do we see flashes before we hear the sounds?

• light travels faster than sound

• light travels slower than sound

Which is translucent?

• x

• y

• z

Which is opaque?

• x

• y

• z

1. Which material is best at reflecting light: metal or glass?

• metal

• glass

1. Light hits a plane mirror with an angle of incidence of 20^o. What will the angle of reflection be?

• 20

• 30

• 10

1. The diagram shows a ray of light from a fly to a fish. The fish can see the fly.

What happens to the direction of the ray of light as it enters the water?

• A) It bends towards the normal.

• B) It is reflected deeper into the water.

• C) It bends away from the normal.

• D) It bends down into a less dense material.

What happens to the speed of the ray as it enters the water?

• increases

• decreases

Which colours are reflected by Man's trousers on the left side of the diagram?

• All colours

• Red

Which colours are reflected by the body on the left side of the diagram?

• all colours

• none

On the right side, which colour is reflected by the trouser?

• All colours

• none

• only red