Question

an object is placed at a distance of 40 cm from a mirror the image of the object has formed on the screen and it is three
time large than the object find the object distance if the radius of a curvature of the mirror is 60 CM

Answer 1

Answer:

40cm

Explanation:

given,

m= -v/u= -3

therefore

v=3u

focal length(f)= -30 cm

from mirror formula

1/v + 1/u= 1/f

1/3u + 1/u = 1/(-30)

so u= -40cm

i.e., object must be at a distance of 40cm from the mirror.