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Manipal MET2019PhysicsRay Optics

A point object O is placed in front of a glass rod having spherical end of radius of curvature 30 cm . The image would be formed at

Options

  1. A30 cm left
  2. Binfinity
  3. C1 cm to the right
  4. D18 cm to the left

Correct answer

A. 30 cm left

Step-by-step solution

Focal length of glass rod, f= R 2 = 30 2 =15 ~cm Distance of object, u=-15 ~cm From formula, aligned ₂ v - ₁ u & = ₂- ₁ R ₂ & =1.5 (for glass) ₁ & =1 (for air) 1.3 v & =- 1 -15 = 1.5-1 30 1.5 v + 1 15 & = 0.5 30 1.5 v & = 1 60 - 1 15 1.5 v & = -1 20 v & =-30 ~cm aligned

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