Light. Light is a form of energy light makes things move Crooke’s Radiometer Solar powered calculator (what is moving …. ? ……in the wires…..)

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Presentation transcript:

Light

Light is a form of energy light makes things move Crooke’s Radiometer Solar powered calculator (what is moving …. ? ……in the wires…..)

Light travels in straight lines

click to start

Shadows and eclipses lunar eclipse = moon in shadow of earth OHP and demo solar eclipse = earth in shadow of moon (moon blocks out the light of the sun)

Solar eclipse in action SUN Moon passes in between us and sun

Reflection of Light Light bounces off a surface. Angle IN = Angle OUT

go to animation slide 12 powerpoint\Light.ppt

Periscope Both mirrors at 45 o We can see over tall people or wall used in submarines image = right way round = why?

go to animation slide 15 powerpoint\Light.ppt

Refraction refraction is the bending of light as it passes from one transparent substance to another Click to start

Refraction – pools are deeper than they seem slide 26 slide 19 powerpoint\Light.ppt

The eye “thinks” the light is going in a straight line.

Which way does light bend? towards the more dense material

Lens – concave or convex work because of refraction go to school website xConcaveLens.htm xConcaveLens.htm

which type of lens is this?

and this…?

Convex makes rays Converge (come together) Concave makes rays Diverge (move apart)

Dispersion Dispersion is the splitting up of white light into the colours of the rainbow. click to start

Summary of facts Light is a form of energy Light travels in straight lines. Light can be reflected (bounce off) a surface. Light shows refraction. White Light can be broken into different colours = dispersion

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