JEE Mains · Physics · STD 12 - 9. Ray optics and optical instruments
Given below are two statements : one is labelled as Assertion \(A\) and the other is labelled as Reason \(R\). Assertion \(A :\) For a simple microscope, the angular size of the object equals the angular size of the image. Reason \(R\) : Magnification is achieved as the small object can be kept much closer to the eye than \(25\, cm\) and hence it subtends a large angle. In the light of the above statements, choose the most appropriate answer from the options given below:
- A \(A\) is true but \(R\) is false
- B Both \(A\) and \(R\) are true but \(R\) is \(NOT\) the correct explanation of \(A\).
- C Both \(A\) and \(R\) are true and \(R\) is the correct explanation of \(A\)
- D \(A\) is false but \(R\) is true
Answer & Solution
Correct Answer
(C) Both \(A\) and \(R\) are true and \(R\) is the correct explanation of \(A\)
Step-by-step Solution
Detailed explanation
\(\theta^{\prime}=\frac{ h }{ u _{0}} ; \theta^{\prime}\) is same for both object and image \(m =\frac{\theta^{\prime}}{\theta}=\frac{ D }{\mu_{0}}\) \(u _{0} < D\) Hence \(m > 1\)
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