1.

The focal length of a concave mirror is f and the distance from the object to the principal focus is \[x\]. Then the ratio of the size of the image to the size of the object is:

A. \[\frac{(f+x)}{f}\]
B. \[\frac{f}{x}\]
C. \[\sqrt{\frac{f}{x}}\]
D. \[\frac{{{f}^{2}}}{{{x}^{2}}}\]
Answer» C. \[\sqrt{\frac{f}{x}}\]


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