how lamp and scale arrangement is used to measure angle of deflection in a coil?
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A lamp and scale arrangement, used to measure small deflection is shown in the figure. SS' is the glass scale placed at a distance of 1m from the plane mirror. MM and I is the position of the light spot formed after reflection from the underdeflected mirror MM. The mirror is deflected by 10
o
and comes to the deflected position M'M'. The distance moved by the spot on the scale
Explanation:
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