InterviewSolution
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InterviewSolution
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At what distance should an object be placed from a lens of focal length 25 cm to obtain an image on a screen placed at a distance of `50 cm` from the lens ? What will be the magnification produced in this case? |
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Answer» Here, `u=?, f=25 cm, v=50cm, m=?` From `(1)/(v) - 1/u = (1)/(f), - 1/u = (1)/(f) - (1)/(v) = 1/25 - 1/50 = 1/50` `u = -50cm`. And `m = v/u = 50/-50 = -1` Negative sign of m indicates that image would be inverted. |
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