Question

a 2 cm high object is placed at a distance of 20 cm from a concave mirror a real image is formed at 40 cm from the mirror calculate the focal length of the mirror also find the height of the image formed​

Answer 1

Answer:

h1=2cm

u=-20cm

v=-40 cm

1/v+1/u=1/f

1/(-40) +1/(-20)=1/f

-1-2/40=1/f

-40/3=f

-13.333=f

h2/h1=-v/u

h2/2=2

h2=4cm