Question

The image of a candle flame placed at a distance of
30cm from a mirror is formed on a screen placed in front
of the mirror at a distance of 60 cm from its pole. What is
the nature of the mirror? Find its focal length.

Answer 1

Answer:

Here, u=−30cm,v=−60cm

As 1f=1v+1u=1−60+1−30=−120

f=−20cm,

The mirror is concave.

As the image is formed on the screen, it is real and inverted

From h2h1=−vu=+60−30=−2

h2=−2h1=−2×2.4cm=−4.8cm

This is the size of inverted image.