Where must an object be placed in front of a convex lens of focal length 20cm toobtain a real and four times magnified image? Where will the image be formed?

Question

Where must an object be placed in front of a convex lens of focal length 20cm toobtain a real and four times magnified image? Where will the image be formed?
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Solution 1

To solve this problem, we need to use the lens formula and magnification formula.

  1. Lens formula: 1/f = 1/v - 1/u
  2. Magnification formula: m = -v/u

Given:

  • Focal length (f) = 20 cm
  • Magnification (m) = -4 (It's negative because the image is real and inverted)

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