Given below are two statements:
Statement-I: A plane wave after passing through prism remains as plane wave but passing through small pin hole may become spherical wave.
Statement-II: The curvature of a spherical wave emerging from a slit will increase for increasing slit width.
In the light of the above statements, choose the correct answer from the options given below.
- A
Both Statement-I and Statement-II are false.
- B
Both Statement-I and Statement-II are true.
- C
Statement-I is true but Statement-II is false.
- D
Statement-I is false but Statement-II is true.
Statement-I: A prism refracts a plane wave into another plane wave (uniformly tilted). A pinhole acts as an effectively point source by Huygens' principle, producing a spherical wavefront. True.
Statement-II: Diffraction spreading angle from a slit of width is . Increasing decreases the spreading, so the emerging wave is closer to a plane wave (smaller curvature). The statement claims curvature increases with width, which is the opposite. False.
Option (3).
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