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Question

The convex surface of a thin concav–convex lens of glass of refractive index 1.5 has a radius of curvature of 20 cm The concave surface has a radius of curvature of 60 cm The convex side is silvered and placed on a horizontal surface as shown in the figure The focal length of the combination has the magnitude

  1. 8.6 cm    
  2. 7.5 cm    
  3. 1.5 cm    
  4. 15 cm    

The correct answer is: 7.5 cm

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