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InterviewSolution
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A concave mirror of focal length 10 cm is placed at a distance 35 cm from a wall. How far from the wall should an object be placed so that its real image is formed on the wall ? |
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Answer» `"f = 10 cm, "upsilon " = 35 cm"` `(1)/(f)=(1)/(upsilon)+(1)/(-u)" (using sign convention)"` `(1)/(u)=(1)/(upsilon)-(1)/(f)=(1)/(35)-(1)/(10)` `(1)/(u)=(10-35)/(35xx10)=(-1)/(14)` `U = -14cm.` Distance of the object from the wall `=35-14=21cm`. |
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