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How far should an object be from the pole of a concave mirror of a focal length 20cm to form a real image whose size is 1/5 th of the image of the object. plz answer fast |
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Answer» The size of image is 1/5th of that of OBJECT... So, I=5*Of=20cmI/O=v/u5*O/O=v/u5/1=v/uTherefore, v=5uNow, we have to apply the formula1/f=1/v-1/u1/f=1/5u-1/u1/20=1/5u-1/uOn taking LCM...1/20=(1-5)/5u1/20= -4/5u5u= -4*205u=-80u= -80/5 =-16cmTherefore, The object should be kept at U which is 16CM(-ve)Hope it helps... MARK it as the brainliest |
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