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Separation between slits are (r₁ = 16 cm) and (r₂ = 9 cm). Actual distance of separation = √r₁r₂ = √16×9 = 12 cm.

1. r₁ = 16 cm
2. r₂ = 9 cm
3. √r₁r₂ = 12 cm
4. r₁r₂ = 144 cm²

Correct answer: √r₁r₂ = 12 cm

Solution

The actual distance of separation is calculated as √r₁r₂ = √16×9 = 12 cm, which matches option C.

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