Light Flashcards
When dose light bend and why?
Light bends when travelling through different mediums. It bends because it changes speed.
When does light travel fastest?
In a vacuum
When does light travel slowest?
In optically denser materials, like glass, water and air.
How do lenses work?
Their curved surface refracts the light and bends it.
What lens brings light to a focus?
Convex/converging lens
What lens spreads out light?
Concave/diverging lens
What can white light be split into?
The colours of the rainbow 🌈 ROY.G BIV
How do we split up the white light and what is it called?
We split the white light by refracting it through a prism. This is called dispersion.
Why does dispersion occur?
Because violet slows down more and bends more than red light.
What is the electromagnetic spectrum?
The spectrum of light.
What is the order of the EM spectrum?
Gamma, X-Ray, Ultraviolet, Visible, infared, microwaves, radio.
What are the properties of gamma rays?
Passes through skin and tissue, some can be absorbed by cells, kills bacteria and used to detect cancer.
Can cause cancer.
What are the properties of X-Ray?
Passes through skin and tissue. Detects bones and teeth.
Can cause cancer.
What are the properties of UV light?
It is in sunlight.
Can cause sunburn and cancer
What are the properties of visible light?
All visible
