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.

Question

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.

G1 Physics · Accepted Answer

Statement-I is true. A prism changes the direction of propagation of a plane wave but does not necessarily convert a plane wavefront into a spherical wavefront. A very small aperture behaves approximately as a secondary point source, so the transmitted wave can spread as a spherical wave. Statement-II is false in the sense used in diffraction. For a slit of width a, the characteristic diffraction angle is θ ≈ λ/a. Increasing the slit width decreases the diffraction angle and makes the emerging…