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# Lenses

### Stack #18787

A converging lens is fatter at the centre than at its edge, it will bring together a beam of light, another name for this lens is? A convex lens
A lens that spreads out the beam of light and is thinner in the middle than at its edges is ? A diverging lens
The lens converges the parallel beam through a point called the principal focus, the distance from the lens to this point is called the focal length, what is the formula relating the focal length to the power of the lens? P = 1/f The unit is the dioptre
What is the formula for the refractive index between two materials? sin i/sin r = V1/V2
The equation connecting the distance of an object from the lens and the distance for its image is? 1/u + 1/v = 1/f Where u is the object to lens distance and v the image to lens distance
Created by: stevie on 2005-05-06