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Statement $I:$ When light travels from one medium to another, then frequency remains constant.
Statement $II:$ When the direction of light ray is reversed, the ray simply retraces its path, this statement is called the Principle of reversibility of light.

• A
  Both Statements are true. Statement$-II$ is the correct explanation of Statement$-I.$
• ✓
  Both Statements are true, Statement$-II$ is not correct explanation of Statement$-I.$
• C
  Statement$-I$ is true, Statement$-II$ is false.
• D
  Statement$-I$ is false. Statement$-II$ is true