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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 A small object is placed on the principal axis of the combination, at a distance of 30 cm in front of the mirror The magnification of the image is

  1. negative fraction numerator 1 over denominator 3 end fraction    
  2. fraction numerator 3 over denominator 4 end fraction    
  3. 5    
  4. plus fraction numerator 1 over denominator 3 end fraction    

The correct answer is: negative fraction numerator 1 over denominator 3 end fraction

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