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myNotes

LIGHT

& SIGHT

4 When it is dark at bedtime and you want to read,
you turn your lamp on. We use light from lamps to

see when it is dark.

Luminous Things

5 Things that give off light are luminous. The sun is
luminous. We use light from the sun to see things
during the day. Lamps, fires, televisions, and

flashlights are luminous, too.

Making Shadows

6 Light from luminous objects travels in straight lines.
It can move through clear things such as air, water,
and glass. That is how windows let light inside our
homes so we can see. We say clear things are

transparent. If you close your curtains, you stop
light from getting inside. The curtains are opaque
(o-pake). Opaque things do not let light through.

When light cannot pass
through something, it
can create a shadow.

luminous If something is luminous, it gives off light.
transparent If an object is transparent, you can see through it.

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