Light can be refracted. Light always travels in straight (13)
medium into another, it changes direction slightly. Refraction occurs because light travels at different speeds through
different materials. When light passes through air into water, for example, it slows down. The light rays are bent
slightly. You can see this if you put a pencil into a half-glassful of water. The pencil looks bent or broken at the water
But when it passes from one
N:
(14)
This is due to (15)
. Objects that we see get their color from the light they
reflect. A green object looks green because it absorbs all other colors but reflects green.
Light can be transmitted. Sometimes light passes through matter. This is called transmission. Light is transmitted
through some matter more easily than through other kinds of matter. Light is transmitted through water, air, and glass
very easily. These materials are said to be transparent. Transparent materials (16)
light to be
transmitted through them easily. Some matter transmits some, but not all, of the light that hits it. This (17)
is called translucent. Some examples of translucent material are (18)
paper or
glass blocks. Opaque matter does not transmit any light. You cannot see through it because light doesn't pass through
it. A book and a brick wall are two examples of opaque (19)​