Q.

The magnification of an object placed it front of a convex lens of focal length 20 cm is + 2. To obtain a magnification of -2, the object will has to be moved a distance equal to

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a

10 cm

b

20 cm

c

30 cm

d

40 cm

answer is B.

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Detailed Solution

When magnification is + 2.u = -x ;  v = -2x  ;f = +20Using   1−2x+1x=120or   x=10  cmTo  have  a  magnification  of  −2u=−yv=+2yand    f=+20∴12y+1y=120or   y=30 cm   ∴y−x=20  cm
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The magnification of an object placed it front of a convex lens of focal length 20 cm is + 2. To obtain a magnification of -2, the object will has to be moved a distance equal to