3. Ria and Ravi were given one mirror each by their teacher. Ria found her image to be erect and
of the same size whereas Ravi found his image erect and bigger in size. This means that the
mirrors of Ria and Ravi are, respectively-
(a) plane mirror and concave mirror (b) concave mirror and convex mirror
(c) plane mirror and convex mirror (d) convex mirror and plane mirror
4. The tendency of similar particles to stick to one another is called
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