The focal distance of a plane mirror is
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Correct Answer: Option D
Detailed Explanation:
Focal length of a mirror is f = R/2, where R is the radius of curvature.
A plane mirror has zero curvature (flat surface), so R = ∞. Therefore, f = ∞/2 = ∞. Parallel rays reflecting from a plane mirror remain parallel and never converge or diverge to form a focus point.
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