In front of a concave mirror, an object is placed at a distance d 1 , from the focus and the real image is formed at a distance d 2 , from the focus, Then the focal length of the mirror is

Haryana Police Female Constable 30 Dec 2018 Paper

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In front of a concave mirror, an object is placed at a distance d₁, from the focus and the real image is formed at a distance d₂, from the focus, Then the focal length of the mirror is

$√{d_{1}d_{2}}$
d₁d₂
$\;{(d_{1}\;+\;d_{2})}/{2}$
$√{\;{d_{1}}/{d_{2}}}$

Validate

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