Question

a concave mirror of radius of curvature 30cn produces a real image 3 times the size of object the distance between object and image is
a) 120cm
b) 80cm
c) 40cm
d) 24cm​

Answer 1

Answer:

(c) 40 cm

Explanation:

m=3=-v/u

=>v=-3u

given r=30 cm  => f=r/2 = 15cm

using mirror formula

1/v + 1/u =1/f

where v=-3u, u=u and f=-15

-1/3u + 1/u = -1/15

=>u= -10 cm

v=-3u = -3(-10) = +30cm

∴v-u = 30 - (-10)

        =40 cm

HOPE IT HELPS...IF IT DOES ..PLS MARK BRAINLIEST....