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Question

An object of height 2.0 cm is placed at a distance 20 cm in front of a concave mirror of focal length 12 cm. Find the position, size and nature of the image.

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Solution

u = -20 cm

f = -12 cm

h = 2 cm

Mirror formula = 1f = 1v + 1u

1v = 1f1u

1v = 112120

1v= 120112

v = -30 cm

Image is real and is formed at a distance of 30 cm from the pole.

hiho= vu
hiu = 3020

hi = -3

Image is inverted and its size is 3 cm.


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