In a concave mirror experiment, an object is placed at a distance x1 from the focus and the image is formed at a distance x2 from the focus. The focal length, f, of the mirror would be (x1x2)^1/2 equal to (x1/x2)^1/2 equal to: (x1 + x2)/2 equal to: (x1x2) equal to
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With a concave mirror, an object is placed at a distance $x_{1}$ from the principal focus, on the principal axis. The image is formed at a distance $x_{2}$ from the principal focus. The focal length of the mirror is (a) $x_{1} x_{2}$ (b) $\frac{x_{1}+x_{1}}{2}$ (c) $\sqrt{\frac{x_{1}}{x_{2}}}$ (d) $\sqrt{x_{1} x_{2}}$
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A concave mirror of focal length $\mathrm{f}$ produces an images n times the size of the object. If the image is real then What is the distance of the object from the mirror? (A) $(\mathrm{n}+1) \mathrm{f}$ (B) $[(\mathrm{n}-1) / \mathrm{n}] \mathrm{f}$ (C) $(\mathrm{n}-1) \mathrm{f}$ (D) $[(\mathrm{n}+1) / \mathrm{n}] \mathrm{f}$
An object $O$ is placed in front of a small plane mirror $M_{1}$ and a large convex mirror $M_{2}$ of focal length $f$. The distance between $O$ and $M_{1}$ is $x$, and the distance between $M_{1}$ and $M_{2}$ is $y$. The images of $O$ formed by $M_{1}$ and $M_{2}$ coincide. The magnitude of $f$ is (A) $\frac{x^{2}-y^{2}}{2 y}$ (B) $\frac{x^{2}+y^{2}}{2 y}$ (C) $x-y$ (D) $\frac{x^{2}+y^{2}}{x-y}$
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