Which of these has virtual focus-concave lens-convex lens-convex mirror-both -a- and -b-

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Standard IX

Physics

Focus of a Concave Lens

Which of thes...

Question

Which of these has virtual focus?

concave lens

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convex lens

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convex mirror

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both (a) and (b)

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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 these 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.