Physics-
General
Easy

Question

A bi-convex lens is formed with two thin planoconvex lenses as shown in the figure. Refractive index ‘n’ of the first lens is 1.5 and that of the second lens is 1.2. Both the curved surface are of the same radius of curvature R=14 cm. For this bi-convex lens, for an object distance of 40 cm, the image distance will be

  1. -280.0 cm    
  2. 40.0 cm    
  3. 21.5 cm    
  4. 13.3 cm    

The correct answer is: 40.0 cm

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