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NEET2009PhysicsRay OpticsActual

A short linear object, of length l , lies along the axis of a concave mirror, of focal length f , at a distance d from the pole of the mirror. The size of the image is then (nearly)

Options

  1. Al f d-f
  2. Bd-f l f
  3. Cl f^2 (d-f)^2
  4. D(d-f)^2 f^2 l

Correct answer

C. l f^2 (d-f)^2

Step-by-step solution

Use 1 v + 1 u = 1 f Find v₁ , when u=d and v₂ , when u=d+l Size of image =v₁-v₂=l ( f d-f )^2

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