Assertion : In Young?s experiment, the fringe width for dark fringes is different from that for white fringes. Reason : In Young?s double slit experiment the fringes are performed with a source of white light, then only black and bright fringes are observed. [AIIMS 2001]

• A. If both assertion and reason are true and the reason is the correct explanation of the assertion.
• B. If both assertion and reason are true but reason is not the correct explanation of the assertion.
• C. If assertion is true but reason is false.
• D. If the assertion and reason both are false.
• E. If assertion is false but reason is true.