An erect image is seen of $\large\frac{1}{5} $ th the height of the object kept at a distance of $20 \;cm$ from a mirror. The mirror must be :

Question

(a)plane mirror

(b)concave mirror

(c)convex mirror

(d)Plano concave mirror

Answer 1

Small image is formed only by convex mirror , plane mirror forms image of same size, concave mirror forms image bigger then object.

Then it is the convex mirror.

Hence 'c' is the correct option