Which of the following has virtual focus?

concave lens

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convex lens

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convex mirror

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both (a) and (c)

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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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Which of the following has virtual focus?

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.