an object of height 1.2m is placed before a concave mirror of focal length 20cm so that a real image is formed at the distance of 60cm of it.find position of an object and height of the image formed
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Answer:
u = 30 cm
Explanation:
We have given :
Focal length = 20 cm
Image distance = 60 cm
We have to find object distance .
We know :
1 / f = 1 / v + 1 / u
Since image formed is real :
f = - 20 cm and v = - 60 cm
1 / u = 1 - 3 / 60
u = - 30 cm
Hence object distance is 30 cm .
Also given object height = 1.2 cm
We know :
h_i / h_o = - v / u
h_i / 1.2 = - 60 / 20
h_i = - 2.4 cm
Hence image height is 2.4 cm .
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