Lenses

Different Lenses produce different kinds of images- form images by refracting light and changing its direction. 

CONVEX- 

bulges outwards and causes rays of light parallel to the axis to be brought together (converge) at the principal focus. 

CONCAVE- 

caves inwards and causes rays of light parallel to the axis to be sprea out (diverge). 

Axis of a lens is the line passing through the middle of the lens 

Principal focus of convex lens= where rays hitting lens parallel to the axis meet.

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