Given below are two statements:
Statement-$I$: $A$ plane wave after passing through a prism remains a plane wave,but passing through a small pinhole may become a 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.