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Page 1

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Concave and Convex

A lens uses refraction to change the direction of rays of light.
Red light is refracted the LEAST and purple light is refracted the MOST.


Lenses are used throughout the world for many different things such as glasses to correct
vision.

Two types of lenses:



CONVEX: This…

Page 2

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(CONVERGING LENS)
At points A, the incident ray is refracted TOWARDS the normal as it is entering a denser
medium. The normal is an imaginary line at a perpendicular to the point at which the incident
ray enters the lens. At points B, the ray is refracted AWAY from the…

Page 3

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The blue circle is called the VIRTUAL FOCUS. It is a focal point that is formed, but is not
actually there. It isn't real, unlike the other focal points. It is behind the lens, rather like a
mirror.


A thinner lens is weaker and has a longer focal length.


A…

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