Physics-
General
Easy

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 combination behaves like

  1. a concave mirror    
  2. a convex mirror    
  3. a concave lens    
  4. a convex lens    

The correct answer is: a concave mirror

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