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In a Fresnel biprism experiment, the two positions of lens give separation between the slits as 16 cm and 9 cm respectively. What is the actual distance of separation?
(a) 12.5 cm
(b) 12 cm
(c) 13 cm
(d) 14 cm
(b)Separation between slits are (r1=) 16 cm and (r2=) 9 cm. Actual distance of separation √(r_1 r_2 )= √(16×9) = 12 cm
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