Physics-
General
Easy

Question

In the figure shown a point object O is placed in air on the principal axis. The radius of curvature of the spherical surface is 60 cm is the final image formed after all the refractions and reflections.

  1. If d subscript 1 equals 120 cm, then the ' I subscript f ' is formed on ' O ' for any value of d subscript 2 .
  2. text  If  end text d subscript 1 equals 140 cm comma text  then the  end text to the power of straight prime I subscript f superscript straight prime to the power of straight prime text  is formed on  end text to the power of straight prime straight O to the power of straight prime text  only if  end text d subscript 2 equals 360 cm
  3. text  If  end text d subscript 1 equals 240 cm text , then the '  end text I subscript f text  ' is formed on '  end text straight O text  ' for all values of  end text d subscript 2 text .  end text
  4. text  If  end text d subscript 1 equals 240 cm comma text  then the '  end text I subscript f text  ' cannot be formed on '  end text straight O text  '  end text

The correct answer is: If d subscript 1 equals 120 cm, then the ' I subscript f ' is formed on ' O ' for any value of d subscript 2 .

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