Unit 2: Light
Lesson 1: Artificial and Natural Sources of Light
Natural Light Sources
Light that comes from nature such as firefly or sun. |
Artificial Light Sources
Light that comes from human made things such as flashlights and Ipads. |
Lesson 2: Why do we see colours?
Light reflection and absorption
We see colours because things reflects colours and absorbs others. So in this picture, the white light hits the pear. However, only yellow is reflected back to our eyes. All the other colours are absorbed!
We see colours because things reflects colours and absorbs others. So in this picture, the white light hits the pear. However, only yellow is reflected back to our eyes. All the other colours are absorbed!
Lesson 3: Light Refraction
Light refraction happens because water bends when it changes from one medium to another. Example, air to glass. Air to water. Air to glass to air again.
Refraction makes spear fishing difficult. When the light reflects off the fish in the water, it tricks the eye because it refracts coming out of the water.
Refraction lets us make magnifying lenses. Light can be refracted in a way with lenses so that it makes things look bigger.
Refraction of light lets us see rainbows. White sunlight refracts through the water droplets after the rain to show us all the colours of white light. Violet, Indigo, Blue, Green, Yellow, Orange Red.