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The ratio of the size of the image to the size of the object is known as

1. focal plane
2. transformation ratio
3. efficiency
4. magnification

Correct answer: magnification

Solution

Magnification is defined as the ratio of the size of the image to the size of the object. The other choices refer to unrelated concepts: focal plane is a location, transformation ratio is not the standard optics term here, and efficiency measures usefulness or output.

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