Question
Sat October 29, 2011 By:
 

sir, my question is what are the rules of image formation by spherical lenses?

Expert Reply
Sun October 30, 2011

In case of the spherical lenses,

(i) all distances in a lens are to be measured from

optical centre of the lens,

(ii) distances measured in the direction of incident ray are taken to be positive,

(iii) distances opposite to the direction of incident ray are taken to be negative.

(iv) the height of the object or image measured above

the principal axis are taken positive whereas below

it, are taken negative.
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