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.
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.✓ Correct
- (D)Statement-I is false but Statement-II is true.
Answer: (C)
Solution
Statement-I is correct: A plane wave passing through a prism undergoes refraction but remains a plane wave. However, passing through a small pinhole causes diffraction, converting it to a spherical wave.
Statement-II is incorrect: Increasing the slit width decreases the diffraction angle (), reducing wave spreading. A narrower slit produces higher curvature (more spherical), while a wider slit produces lower curvature (flatter wave).
Therefore, Statement-I is true but Statement-II is false.
Statement-II is incorrect: Increasing the slit width decreases the diffraction angle (), reducing wave spreading. A narrower slit produces higher curvature (more spherical), while a wider slit produces lower curvature (flatter wave).
Therefore, Statement-I is true but Statement-II is false.
JEE Main · 2026 · 28 Jan 2026 · Shift 1 · Single correct option