Image position and size by a spherical mirror (mirror formula)

1. A.
   $\frac{2d_{1}d_{2}}{d_{1} - d_{2}}$
2. B.
   $\frac{2d_{1}d_{2}}{d_{1} + d_{2}}$
3. C.
   $\frac{d_{1}d_{2}}{d_{1} + d_{2}}$
4. D.
   $\frac{d_{1}d_{2}}{d_{1} - d_{2}}$

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1. A.
   $100\text{ }cm$
2. B.
   $60\text{ }cm$
3. C.
   $160\text{ }cm$
4. D.
   $40\text{ }cm$

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1. A.
   $\frac{1}{2}$
2. B.
   2
3. C.
   3
4. D.
   $1/3$

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