In Fresnels biprism experiment the width of 10 fringes is \( 2 \mathrm{~cm} \) which are formed ...

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In Fresnels biprism experiment the width of 10 fringes is \( 2 \mathrm{~cm} \) which are formed at a distance of two
\( \mathrm{P} \)
2 meter from the slit. If the wavelength of light is
W
\( 5100 \AA \) then the distance between coherent sources will be
(1) \( 5.1 \times 10^{-4} \mathrm{~m} \).
(2) \( 5.1 \times 10^{4} \mathrm{~cm} \).
(3) \( 5.1 \times 10^{-4} \mathrm{~mm} \)
(4) \( 10.1 \times 10^{-4} \mathrm{~cm} \)
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