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Asked by eknathmote50 | 08 May, 2019, 10:33: AM
Expert Answer
Figure shows the bright object placed on principal axis at a distance u = 30 cm from a concave mirror of focal length f = 20 cm.
If there is no plane mirror , image will be formed at v, that is obtained from concave mirror equation, (1/u) + (1/v) = 1/f .............(1)
if we substitute u = 30 and f = 20 in eqn.(1), we get v = 60 cm.
It is required to place the plane mirror on principal axis to get image coincide with the object after reflection from plane mirror.
Let x is the distance between object and plane mirror. Hence we have , 30 + 2x = 60 .................(2)
From eqn.(2), we get x = 15 cm as shown in figure.
Hence plane mirror is placed at 30+15 = 45 cm from concave mirror
Answered by Thiyagarajan K | 09 May, 2019, 06:17: AM
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