A series of 3 colduned glass plates of equal thickness are placed in a light beam. Each sheat absorbs one quanter of the light incident upon it. What is the intensity of the sight transmitted by the third glass plate?
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A glass plate of thickness 12×10
−3
mm is placed in the path of one of the interfering beams in Young's double slit arrangement. Light of wavelength 6000A
o
is used in the arrangement. If the central band is shifted by a distance equal to 40times the width of bands then the refractive index of glass will be
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