Question

A concave mirror has a …………… focus, whereas a convex mirror has a …………… focus.
(a) real and virtual, real
(b) real, virtual
(c) virtual, real
(d) virtual, real and virtual

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Answer

(b) real, virtual

Reason — A concave mirror has a real focus because the light rays incident parallel to the principal axis, after reflection actually pass through the focus.
A convex mirror has a virtual focus because the light rays incident parallel to the principal axis, appear to come from the focus after reflection from the mirror.

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