Question

The object is 1.5m forms on a mirror which formed an errect image one-fourth[exactly the same size of the object determine the focal length of the mirror what type of mirror is it

Answer 1

u=−2m

m=+

4

1

(Erect image)

m=

u

v

4

1

=

−2

v

v=−0.5m

v

1

−

u

1

=

f

1

−0.5

1

−

−2

1

=

f

1

f=−0.666m=−66.6cm

It is a convex lens.