Question

An object of size 2 centimetre is placed at a distance of 20 cm from a concave mirror its inverted and real image is 40 cm from the mirror and draw scale diagram and locate focus also measure the focal length and size of the image

Answer 1

Height of object = 2cm

Object distance = 15cm

Focal length = 10cm

1/f = 1/v +1/u

-1/10 = -1/15 +1/v

1/v = -3 +2 /30

v = -30 cm

Height of image/Height of object = -v /u

Height of image / 2 = 30/-15

Height of image = - 4cm

Nature - Real and inverted

Position - 30 cm from concave mirror

Size = 4 cm