Question

an object of height 10 centimetre is positioned at 30 cm from a concave mirror with a focal length 8 cm find the image position and nature of image

Answer 1

Answer:

height of object = 10cm

u object distance = -30cm

f focal length = -8cm

by formula

1/f = 1/v+1/u

i.e. 1/v = 1/f - 1/u

i.e. 1/v = 1/-8 - 1/-30

i.e. 1/v = -1/8 + 1/30

i.e. 1/v = -15/120 + 4/120

i.e. 1/v = -11/120

i.e. v = 120/-11

i.e. v = -10.91 cm

Therefore the image is formed on the same side i.e. in front of mirror at the distance of 10.91 cm.

As the image is formed on the same side the image is real and inverted.