Unit 6_ Lights

What happen when a light ray reach a plane surface

• reflection

• refraction

• dispersion

• spectrum

• formation of asteroid

Reflection is when....

• a light ray reaches a plane surface and bounces off

• a light ray reaches any surface and bounces off

• a light ray reaches a plane surface and changes direction

• a light ray reaches any surface and changes direction

Refraction is when....

• a light ray reaches a plane surface and bounces off

• a light ray reaches any surface and bounces off

• a light ray reaches a plane surface and changes direction

• a light ray reaches any surface and changes direction

What causes refraction of light?

• the change of speed of light

• the change of colour of light

• the change of direction of light

• all of the answers are incorrect

What is medium?

• The material light passes through is medium.

• The material that light can't passes through

• The material that prevent light from passing through

Compare the speed of light in water and the speed of light in air

• the speed of light in water < the speed of light in air

• the speed of light in water > the speed of light in air

• the speed of light in water = the speed of light in air

Compare the speed of light in water and the speed of light in glass

• the speed of light in glass < the speed of light in water

• the speed of light in glass > the speed of light in water

• the speed of light in glass = the speed of light in water

Compare the speed of light in air and the speed of light in glass

• the speed of light in glass < the speed of light in air

• the speed of light in glass > the speed of light in air

• the speed of light in glass = the speed of light in air

When the light ray passes from air to the water, the light ray is bent

• toward the normal

• away from the normal

When the light ray passes from glass to the air, the light ray is bent

• toward the normal

• away from the normal