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KVPY2014PhysicsRay Optics

The flat face of a plano-convex lens of focel length 10 ~cm is silvered. A point source placed 30 ~cm in front of the curved surface will produce a :

Options

  1. Areal image 15 ~cm away from the lens
  2. Breal image 6 ~cm away from the lens
  3. Cvirtual image 15 ~cm away from the lens
  4. DVirtual image 6 ~cm away from the lens

Correct answer

B. real image 6 ~cm away from the lens

Step-by-step solution

1 v + 1 u = 1 f 1 f = 1 f m - 2 f 1 f = 1 - 2 10 =- 1 5 f=-5 1 v + 1 -30 =- 1 5 1 v - 1 5 + 1 30 = -6+1 30 = -5 30 v=-6 ~cm

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