unit 5 light เอเต้

Which of these is not a source of light ?

• Sun

• Electric bulb

• Moon

• Flame

Which of these does not allow any light to pass through it ?

• Glass

• Water

• Tracing paper

• Metal

When light travels from one optical medium to another, it.....

• bends

• becomes brighter

• does not bend

• gets blocked

A pencil dipped in water involves with........

• reflection

• refraction

Light travels in................lines.

Objects that allow part of light falling on them to pass through are........

• translucent

• opaque

• transparent

........................substance is also called an optical medium

• transparent

• translucent

• opaque

only the sun can produce its own light

• true

• false

iron is an opaque material

• true

• false

You can see only objects that give off their own light

• true

• false