When a wave enters a medium where it's speed is greater, as the ange of incidence increases, so deos the angle of refraction
At angles greater than the crital angle, the wave is completely refracted rather than refracted. This is known as total internal reflection.
For a converging lens, parrallel rays of light are refracted and meet at the focal point.
The distance from the lens to the focal point is the focal point.
For a diverging lens, the focal point is the point from where the rays seem to be coming from after passing through the lens
Thinner lens = Larger focal length A virtual image can be projected
Power of lens = 1
Focal length(m)
Parallel rays are rays coming from infinity which will never meet
A more gently curving lens has a longer focal length
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