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प्रश्न
What is meant by magnification? Write its expression. What is its sign for the (a) real (b) virtual, image?
उत्तर
Magnification is the ratio of the length of image to the length of the object.
m = `1/"O"`
It is also given as
m = `-"v"/"u"`
Where, u and v is the object and image distance, respectively.
Hence, we have
- For real image: u and v are negative. So, m is negative.
- For virtual image: u is negative and v is positive. So, m is positive.
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