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Question

Which of these has virtual focus?


  1. Concave lens 

  2. Convex lens

  3. Convex mirror 

  4. Concave mirror


Solution

The correct options are
A

Concave lens 


C

Convex mirror 



As for the concave lens the rays seem to be coming from a point behind the lens, that point is the virtual focus. Also, for convex mirrors the rays seem to be originating from the unpolished side of the mirror, so they also have virtual focus.

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