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Offline Centres

Q.

An imaginary line passing through the two centres of curvature of a lens is called_


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a

Principal axis

b

Radius of curvature

c

Straight line

d

None of these 

answer is A.

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Detailed Solution

The imaginary line passing through the two centres of curvature of a lens is called the Principal axis.
The principal axis also passes through the focus and the optical centre of the lens. Below the principal axis, the height of the object is taken as negative, and above, it is taken as positive.
 
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