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प्रश्न
Write an expression for magnification for a lens, explaining the meaning of the symbols used.
संक्षेप में उत्तर
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उत्तर
For a lens: Magnification 'm' is the ratio of the height of the image to the height of the object.
m = `"Height of image (h')"/"Height of object (h)" = ("h'")/"h"`
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