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Hello everyone.
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So in that numerical, that is a somethings are given, that is the height of an object.
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So we are consider a h1 is given, that is a plus 25 centimeter.
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And second thing, the focal length is given, that is consider a plus 30 centimeter.
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And guys, he says the height of an image is also given, that is a minus of a 50 centimeter.
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Okay? now, according to these given situation, we can calculate a measurement.
00:31
Magnification is equivalent to h2 upon h1.
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H2 is a minus of a 50 and h1 is a plus of a 25.
00:41
So we got that the magnification is a minus 2.
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This minus 2 is the magnification and the other formula of a magnification is a v by u.
00:52
So we use that concept.
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V by u is equivalent to a minus 2...