Question

A candle of 2 cm height is placed at a distance of 15cm in front of a convex lens of focal length 10cm . Draw diagram to find the positiin and size of 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