Question

an object 3 cm high is placed at a distance of 10cm in front of a concave mirror of focal length 20 cm find the position nature and size of the image

Answer 1

I=3cm
u=10cm
f=20cm

By mirror formula

1/-f=1/-u+1/-v

1/-20=1/-10+1/-v

1/v=1/-10+1/20

1/v=-2+1/20

1/v=-1/20

v=-20

The image will form 20 cm behind the mirror

Answer 2

Answer:

Nature- Virtual and erect

Position- The image is formed at a distance of 20 cm behind the mirror.

Size- Image size is 6 cm