Question

an object 5cm high is placed 20cm in front of a concavw mirror of focal length 15cm.At what distance from the mirror should a screen be placed to obtain a sharp image?calculate the size of the image formed.​

Answer 1

Explanation:

1/v+1/u=1/f

1/v+1/(-20)=1/(-15)

1/v=1/20-1/15

1/v=-5/300

v=-60 cm

The screen should be placed on 60

cm in front of the mirror