In a Fresnel biprism experiment, the two positions of lens give sep...

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In a Fresnel biprism experiment, the two positions of lens give separation between the slits as \( 16 \mathrm{~cm} \) and \( 9 \mathrm{~cm} \)
\( \mathrm{P} \) respectively. What is the actual distance of separation?

W
(a) \( 13 \mathrm{~cm} \)
(b) \( 14 \mathrm{~cm} \)
(c) \( 12.5 \mathrm{~cm} \)
(d) \( 12 \mathrm{~cm} \)
(1995)
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