If x and y be the distances of the objec

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Target Exam

CUET

Subject

Physics

Chapter

Ray Optics

Question:

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

Options:

xf = y²

xy = f²

x/y = f

x/y = f²

Correct Answer:

xy = f²

Explanation:

According to Newton's formula xy = f²

Note that $m=\frac{f}{f-u}=\frac{f-v}{f}$

or $\frac{f}{x}=\frac{y}{x} \quad \Rightarrow \quad x y=f^2$