Question

a student is 2.5 metre from a convex mirror by her image is 1.5 metre from the mirror what is the focal length​

Answer 1

u= -2.5 m

v= -1.5 m

1/f=1/v + 1/u

1/f=1/-1.5 +1/-2.5

1/f= -16/15

f= -0.9375 m

f= -93.75 cm