Physics
Grade-10
Easy
Question
A magnifying glass is used to see an enlarged image of a fine text. In that case, which of the following is true for the object distance and the image distance?
- Both have the same sign
- Both have different signs
- The object distance is positive, and the image distance is negative
- The object distance is negative, and the image distance is positive
Hint:
The object distance should be positive and the image distance should be negative.
The correct answer is: The object distance is positive, and the image distance is negative
A negative sign is used on the linear magnification equation as a reminder that all real images are inverted. If the image is virtual, the image distance will be negative, and the magnification will therefore be positive for the erect image.
If the image is behind the mirror, it forms virtual image which also holds true in the case of magnifying glass. For this case to exist, image distance should be negative
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