Question

Explain what is meant by the parallel axis of a convex lens?

Answer 1

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Answer- Parallel axis is an imaginary line that passes through the centre of curvature of the lens. Parallel axis is the line on which the the rays when converge meet at a point called focus.
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Answer 2

 
When rays are parallel to the principal axis pass through a convex
lens, they are bent inwards. The point at which they converge is known as principle focus. The distance from the principle focus to the centre of the lens is known as focal length.
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