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Hello everyone.
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So, according to a given situation, so height of an image, so which is consider that the height of image is equivalent to a plus 35 centimetre.
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Why we are considered a positive? because this image is the above side of the principal axis.
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Okay.
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Now, image will be formed in a negative side.
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So we consider a minus of a 49 centimeter.
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Okay.
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And height of an image and height of an object.
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It is also above side of the principal axis, so this is a 25 cm with a positive sign.
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Now we move the magnification formula.
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So, m is equivalent to a h2 divided by h1, and that is also equivalent to a v by u.
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One by one, we put all the values here.
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H2 is given 35, h1 is a 25, equal to v minus of a 49...