What is the geometrical shape of the wavefront when a plane wave passes through a convex lens?

Asked by naren15 | 24th Feb, 2011, 06:09: AM

Expert Answer:

Dear student,
When a plane wavefront pases thorugh a convex lens, it is turned into a contracting wave front of radius f and therefore receives a positive curvature +1/f.
The radius of curvature (R) of a surface is taken as a positive number if it increases the curvature of the waves – i.e. converges the waves and negative if it decreases the curvature of the ways – i.e. diverges the waves.

A surface that converges a wavefront is taken a positive e.g. a convex lens
Hope this helps.

Answered by  | 28th Feb, 2011, 02:09: PM

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