In Newton ring apparatus, at the point of contact of the lens and glass plate, the additional path difference introduced is:
Correct answer: B. λ/2
- A. λ/4
- B. λ/2
- C. λ
- D. λ/3
Explanation
The correct answer is λ/2. In the Newton ring apparatus, when light reflects off the lens and glass plate at the point of contact, a phase shift of λ/2 occurs due to the reflection. This results in an additional path difference of λ/2. Option A (λ/4) and Option D (λ/3) are incorrect because they do not accurately represent the phase shift at the contact point. Option C (λ) is incorrect as it suggests a full wavelength path difference, which does not apply at the point of contact.
This question appeared on the UHS MDCAT 2010 paper, which you can sit online with every answer explained.
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