| Direction: The question has a paragraph followed by two statements, Statement-1 and Statement-2. Of the given four alternatives after the statements, choose the one that describes the statements. |
| A thin air film is formed by putting the convex surface of a plane-convex lens over a plane glass plate. With monochromatic light, this film gives an interference pattern due to light reflected from the top (convex) surface and the bottom (glass plate) surface of the film. |
| A nucleus of mass\[M+\Delta m\]is at rest and decays into two daughter nuclei of equal mass \[\frac{M}{2}\]each. Speed of light is c. |
| Statement-1: When light reflects from the air-glass plate interface, the reflected wave suffers a phase change of \[\pi \]. |
| Statement-2: The centre of the interference pattern is dark. [AIEEE 2011] |
A) Statement-1 is false, Statement-2 is true
B) Statement-1 is true, Statement-2 is false
C) Statement-1 is true, Statement-2 is true and Statement-2 is the correct explanation of Statement-1
D) Statement-1 is true, Statement-2 is true and Statement-2 is not the correct explanation of Statement-1
Correct Answer: A
Solution :
[d] The centre of interference pattern is dark, showing that the phase difference between two interfering waves is \[\pi \]. But this does not imply statement-1.
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