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JEE Main Physics Class 12 Ray Optics and Optical Instruments Part 1 Questions
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Question : 4
Total: 99
An object is gradually moving away from the focal point of a concave mirror along the axis of the mirror. The graphical representation of the magnitude of linear magnification (m) versus distance of the object from the mirror (x) is correctly given by
(Graphs are drawn schematically and are not to scale)
[8 Jan. 2020 II]
Validate
Solution:
Using mirror formula, magnification is given by
m
=
f
u
−
f
=
−
1
1
−
u
f
At focus magnification is
∞
And at
u
=
2
f
,
magnification is 1 .
Hence graph (d) correctly depicts '
m
' versus distance of object '
x
' graph.
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