Q132 / 180 · AIIMS 2010 · Physics

Assertion : If objective and eye lenses of a microscope are interchanged then it can work as teles cope. Reason : The objective lens of telescope has small focal length.

  • A
    If both assertion and reason are true and reason is the correct explanation of assertion
  • B
    If both assertion and reason are true but reason is not the correct explanation of assertion
  • C
    If assertion is true but reason is false
  • Correct answer
    D
    If both assertion and reason are false.

Solution

We cannot interchange the objective and eye lenses of a microscope to make a telescope. The reason is that the focal length of lenses in microscope are very small, of the order of $\mathrm{mm}$ or a few $\mathrm{cm}$ and the difference $\left(f_0-f_e\right)$ is very small, while the telescope objective have a very large focal length as compared to eye lens of microscope.

Hence, the correct answer is option: 'D'.

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