GoalSay that a light source gives out its own light, and name some light sources.
New words
light source · something that makes its own lightflame · the bright, hot part of a fire or a candlescreen · the front of a phone, tablet, computer or television where we see pictures
Explanation
A light source is something that makes its own light. The Sun is our biggest light source. It lights up the day. At night we need other light sources. A lamp or a light bulb gives out light when it is switched on. A torch shines light from a small bulb. A candle flame gives out light, and so does a fire. Phone, tablet and television screens make their own light too. So do street lights and the stars, which are very far away. Never touch fire. Never light a candle or a match yourself.
Worked examples
In the daytime the Sun is our light source. Its light comes down to the Earth.
In a dark room, a torch makes its own light. When you press the switch, the bulb shines.
The lamp by Leo’s front door comes on in the evening and lights up the path.
Class activity
Light hunt (with an adult): walk around your home or school and look for things that make their own light. Make a tally chart with a mark for each one you find: lamp, torch, screen, other. Remember that some are only light sources when they are switched on. Ask an adult to switch things on for you. Never look straight at a very bright light.
Practice
1
What is a light source?
Something that makes its own light.
2
Which of these is a light source? Choose all that are.
A (the Sun) and C (the torch).
3
Name two light sources you can find in a house at night.
For example: a lamp, a light bulb, a screen or a torch.
4
Look at this campsite at night. Which thing here makes its own light?
The oil lamp, when it is lit. The tent and the tree do not make their own light.
