Question

an object 2 cm high is placed at a distance of 10 cm from a concave mirror of radius of curvatute 40 cm find position and size of image formed​

Answer 1

ho=2cm

u=-10cm

R=-40 cm

f=R\2 cm

f=-40/2=-20cm

v=? hi=?

now using mirror formula

1/v=1/f-1/u

=1/-20 -1/-10

=-1/20+1/10

=-1+2

______

20

=1/20

v=20cm

now we know that

hi/ho=-v/u

hi/2=-20/-10

hi=4cm

since size of image is 4 cm and position of image is 20 cm