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A concave lens of focal length 20 cm is placed at a distance of 35 cm from an object. Find the position of the image and its magnification. |
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Answer» Solution :Data supplied, f = - 20 CM, `""` u = - 35 cm ,V = ? ,m = ? `(1)/(f) = (1)/(v) - (1)/(u) "" (1)/(20) = (1)/(+ 35) + (1)/(v)` `(1)/(v) = (-1)/(20) + (-1)/(35) = (-35+ 20)/(20 XX 35) = (- 55)/(700) ""v = (-700)/(55) = - 12.73 ` cm ` m = (v)/(u) = (- 12.73)/(-3.5) = 0.3637 ` |
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