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A-real-image-3-times-the-size-of-the-object-formed-by-a-concave-mirror-on-a-screen-later-both-the-object-amp-the-screen-are-shifted-untill-the-image-formed-is-6-times-the-size-of-the-object-if-t




Question Number 22657 by *D¬ B£$T* last updated on 21/Oct/17
A real image 3 times the size of the   object formed by a concave mirror  on a screen. later both the object   & the screen are shifted untill the  image formed is 6 times the size  of the object. if the distnce moved  is 15cm. calculate the focal length  of the mirror.
$${A}\:{real}\:{image}\:\mathrm{3}\:{times}\:{the}\:{size}\:{of}\:{the}\: \\ $$$${object}\:{formed}\:{by}\:{a}\:{concave}\:{mirror} \\ $$$${on}\:{a}\:{screen}.\:{later}\:{both}\:{the}\:{object}\: \\ $$$$\&\:{the}\:{screen}\:{are}\:{shifted}\:{untill}\:{the} \\ $$$${image}\:{formed}\:{is}\:\mathrm{6}\:{times}\:{the}\:{size} \\ $$$${of}\:{the}\:{object}.\:{if}\:{the}\:{distnce}\:{moved} \\ $$$${is}\:\mathrm{15}{cm}.\:{calculate}\:{the}\:{focal}\:{length} \\ $$$${of}\:{the}\:{mirror}. \\ $$

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