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Presentation on theme: "Light."— Presentation transcript:

1 Light

2 What is Light? Light is composed of particles called photons which are massless bundles of concentrated electromagnetic energy and the travel in waves. Transverse Waves

3 Light travels in straight lines:
Properties of Light Light travels in straight lines: Laser

4 Light travels VERY FAST – around 300,000 kilometres per second.
At this speed it can go around the world 8 times in one second. A light-year is the distance light travels in one year and is a unit of measure.

5 Light travels much faster than sound. For example:
Thunder and lightning start at the same time, but we will see the lightning first. 2) When a starting pistol is fired we see the smoke first and then hear the bang.

6 Electromagnetic Electromagnetic waves- is energy traveling in a wave that is partially electric and partially magnetic. Electromagnetic Spectrum- all the electromagnetic waves that reach earth.

7 Electromagnetic Spectrum
Radio, microwaves, infrared, visible light, ultraviolet, x-rays and gamma rays Organized from longest wavelength to shortest We have various uses for each type of wave

8 Color White light is not a single color; it is made up of a mixture of the seven colors of the rainbow. We can demonstrate this by splitting white light with a prism: This is how rainbows are formed: sunlight is “split up” by raindrops.

9 The colors of the rainbow: (ROY G BIV)
Red Orange Yellow Green Blue Indigo Violet

10 Objects and Light Transparent Objects- visible light can pass through them. Example: Clear glass Opaque Objects- No light passes through them . Example wood, bricks etc. Translucent Object- some light passed through . Example: Frosted Glass

11 Shadows Shadows are places where light is “blocked”: Rays of light
A shadow is formed where light can’t reach. The larger the light source the larger the shadow. Shadows are places where light is “blocked”: Rays of light

12 Polarization Light waves are transverse and that means they can be polarized-when waves travel in one direction. Polarized lenses filter light and caused it to be polarized reducing glare.

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