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JEE Main202127 Aug 2021Morning ShiftPhysicsRay OpticsActual

An object is placed beyond the centre of curvature C of the given concave mirror. If the distance of the object is d 1 from C and the distance of the image formed is d 2 from C , the radius of curvature of this mirror is:

Options

  1. A2   d 1   d 2   d 1 + d 2
  2. B2   d 1   d 2   d 1 - d 2
  3. Cd 1   d 2   d 1 + d 2
  4. Dd 1   d 2   d 1 - d 2

Correct answer

B. 2   d 1   d 2   d 1 - d 2

Step-by-step solution

x y = f 2 f + d 1 f - d 2 = f 2 f = d 1 d 2 d 1 - d 2 R = 2 f = 2 d 1 d 2 d 1 - d 2

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