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A source of light of wavelength 5000Å i...

A source of light of wavelength 5000Å is placed as shown in figure.
Considering interference of direct and reflected rays, determine the position of the
region where the fringes will be visible and calculate the number of fringes.
` (##DCP_V05_C32_S01_021_Q01.png" width="80%">.

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1.9 cm to 3.9 cm from O, 40 fringes
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