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Consider a He-Ne laser cavity consisting of two mirrors of reflectivities R1
1 and
R2 = 0.98. The mirrors are separated by a distance d = 20 cm and the medium in between
has a refractive index no =
1 and absorption coefficient a =
0. The values of the
separation between the modes dv and the width Av,of each mode of the laser cavity are:

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