Question

An object is located 30.0 cm from a passenger's side mirror. The image formed is upright and one third the size of the object.

(a) Is the image real or virtual? Justify your answer.

(b) What is the focal length of the mirror?

(c) Is the mirror concave or convex? Justify your answer.

Answer 1

a)

if an image is smaller, it is only virtual,

b)

$\frac 1 f-\frac 1d=-\frac 1F,$

$F=\frac {fd}{f-d}=\frac{1\cdot \frac 13}{1-\frac 13}=0.5~m,$

c)

smaller image can be only in convex mirror.