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If \mathrm{x} and \mathrm{y} be the distances of the object and image formed by a concave mirror from its focus and \mathrm{f} be the focal length then

Option: 1

\mathrm{\quad x f=y^{2}}


Option: 2

\mathrm{ x y=f^{2}}


Option: 3

\mathrm{ x / y=f}


Option: 4

\mathrm{x / y=f^{2}}


Answers (1)

best_answer

According to Newton's formula \mathrm{x y=f^{2}}.

\mathrm{Note \: that \: m=\frac{f}{f-u}=\frac{f-v}{f}}
\mathrm{or \, \frac{f}{x}=\frac{y}{x} \quad \Rightarrow \quad x y=f^{2}}

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Rishi

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