2. Light is a form of energy.
It is a form of electromagnetic
radiation.
3. Object that emit light are called luminous
and the objects that doesn’t emit light are
called non-luminous.
Most luminous objects such as the
Sun, stars, fire, and candle flames
release light together with a large
amount of heat.
4. The path of the light can be seen because
some of it is reflected from dust in the
atmosphere.
5. How do you classify non-luminous
objects?
Non-luminous materials can be
classified as transparent, translucent
or opaque.
Transparent: Light can pass through it easily.
Translucent: Light can pass through
it, but not as much as transparent
materials.
6. Shadows can only form when an
object an object blocks the light
source.
Shadows are also cast by the Moon and the
Earth.
7. A room might probably be full of
objects but if you were to awake in
the middle of the night, you may not
see them because there is no light
source to reflect it to your eyes.
8. Real images are images that are
produced on a cinema screen by
biconvex lenses.
Virtual images are images that cannot
be projected to a surface but only
appear to exist such as those in a plane
mirror.
9. The periscope consist of two plane
mirrors that may be used together to
give a person at the back of the crowd
a view of an event. The same as the
ones that are used inside the
submarines.
