In a concave mirror, an object is placed at a distance x₁ from
focus, and image is formed at a distance x₂ from focus. Then
focal length of mirror is
(a) √x₁ x₂ (b) x₁ - x₂/2
(c) x₁ + x₂/2
(d)√x₁/x₂
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The answer is (a) √x₁ x₂
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