Question

3. When an object is placed in front of a concave mirror at a distance 15 cm an image is formed on a screen 10 cm away from the mirror. If the object is placed 30 cm away what is the distance to the image?​

Answer 1

u=15

v=10

now,

1/f=1/v+1/u

1/f=1/10-1/15

1/f=(3-2) 30

1/f=1/30

therefore

ans=30cm