To get an image of magnification -1 on a screen using a lens of focal length 20 cm, the object distance must…

To get an image of magnification -1 on a screen using a lens of focal length 20 cm, the object distance must be :
  1. Less than 20 cm
  2. 30 cm
  3. 40 cm
  4. 80 cm

Solution

40cm

Asked in: CBSE

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