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The distance at which an object should be placed from a thin convex lens of focal length 10 cm to obtain a virtual image of double of its size is​
  • a)
    15 cm
  • b)
    – 5 cm
  • c)
    -10cm
  • d)
    5.5 cm
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
The distance at which an object should be placed from a thin convex le...
given : f = 10 cm , m = 2

v / u = 2

v = 2u 

v = 2u -------(1)

according to lens formula , 

1/v - 1/u = 1/f

1/v - 1/u = 1/10 --------(2)

substitute (1) in (2)

1/2u - 1/u = 1/10

1 - 2 / 2u = 1/10

-1 / 2u = 1/10

-10 = 2u

u = -10/2

u = -5 cm

therfore object should be placed 5 cm away from the lens
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The distance at which an object should be placed from a thin convex le...
Answer is 5.5cm because when object is placed b/w f and o then only virtual image is formed
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