Light from bonfires to lasers

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Slide 1

LIGHT !

from bonfires to lasers

Slide 2

Sources of light

Hot objects give out light.

A bonfire

Slide 3

The Sun

Sunset in Venice

Slide 4

Stars

Stars and galaxies give out light.

Picture: Liverpool Telescope

Slide 5

Lightning

Slide 6

A worm living in dark caves sends out light from its tail.

Liquid droplets form a string of shining beads to attract insects.

tail of worm

Slide 7

Some cold things give out light:

some fungi

glow worms

light sticks

LEDs

‘glow-in-the-dark’ stickers

Slide 8

How do we see light sources?

Light travels from a source to our eyes.

We can see sources in a dark room.

Slide 9

Can we see in the dark?

If there is no light

we cannot see anything!

Let’s try a test–

Put a few small objects into the black bag-----

Slide 10

How do we see things that are not sources of light?

Light bounces off

and some reaches our eyes.

Slide 11

On the look out !

How do you know that the baby squirrel watches as it feeds?

Slide 12

Reflection

When light bounces off something

we say the light is reflected.

We can try this with

rough surfaces

and shiny surfaces.

Slide 13

Slide 14

Shiny surfaces

Light is reflected as a beam and can be seen on the wall.

mirror

Slide 15

Move the mirror

The light reaches a different place on the wall.

wall

Slide 16

Look in a mirror