Question

A long concave mirror have a radius of curvature 15m .a person stand 10m in front of the mirror.where the person image form

Answer 1

R=-(15)cm........(1)

R=-(2F) {since concave mirror}

F=R/2=15/2 from (1)

u=-10cm

from mirrors formula we have

1/f=1/v+1/u

1/v=1/f - 1/u

1/v=1/-(15/2) - 1/-(10)

1/v= 1/10- 2/15

1/v= 3-4/30 (L.C.M= 30)

v=-30cm (reciprocal)

Hope u understood the problem clearly....