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3. A concave mirror produces a real image of half the size of an object placed at 60 cm infront of it.Where should the object be placed to obtain a virtual image of double the size of the object ? |
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Answer» Initial obj. dist = -60(real object)". magnification (m) = -1/2 (as both obj and image are real)We know , m= -f/(u-f) [f=focal length]f= -20cmNow , obj dist = u'magnification(m')=2 (as image is virtual of real object)f=-20 cmWe know , m= -f/(u'-f)2=20/(u'+20)u'=-10cmHence , the obj should at a distance of 10 cm in front of the mirror. |
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