25. 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
Answer : (b) 12 cm
\(h_0 = \sqrt{h_1 h_2}\)
\(= \sqrt{16 \times 9}\)
\(= 12 \,\text{cm}\)
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