For a lens, magnification m = +0.5 is obtained. What does the positive sign tell you about the image, and is…

Question

For a lens, magnification m = +0.5 is obtained. What does the positive sign tell you about the image, and is the image larger or smaller than the object?

Accepted Answer

## Model Answer The positive sign indicates that the image is **virtual and erect**. Since |m| = 0.5 < 1, the image is **smaller** than the object. *Source: Chapter 9, Section 9.3.7 (Magnification)* --- ## Explanation Examiners look for two things: (1) what the positive sign means — virtual and erect image — and (2) comparison of image size with object. Since m = +0.5, the magnitude (0.5) is less than 1, so the image is diminished. A common mistake is saying "erect" alone and forgetting "virtual," or confusing magnitude with sign.

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