Question

 What is called optical centre of a lense?

Answer optic centre is the geometrical centre of the lens the rays of light passing through this point emerges in the same direction without bending.
http://wiki.answers.com/Q/What_is_called_optical_centre_of_a_lense

Top Q&A For: What is called optical centre of a lense

What kind of lense attachments can I get for my Fuji finepix S5600 it has a 55mm lense. ?

Wide angle lenses which screw on like filters are available,they often come in a standard size thread called a T-mount,which will need a 55mm to T-mount adapter so it will fit on the front of your... Read More »
http://answers.yahoo.com//question/index?qid=20080916100052AAo0SMd

What happens if you use a centre positive plug on something that asks for centre negative?

There's a good chance you'd fry whatever you plugged it into. At best, it just wouldn't work.
http://answers.yahoo.com/question/index?qid=20130413123713AAtCQvF

What is the difference between 18-55mm lense and a 55-200mm lense?

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