Question

Assertion: Newton's rings are formed in the reflected system when the space between the lens and the glass plate is filled with a liquid of refractive index greater than that of glass, the central spot of the pattern is bright.
Reason: This is because the reflection in these cases will be from a denser to rarer medium and the two interfering rays are reflected under similar conditions.

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

Answer 1

The correct option is A If both assertion and reason are true but the reason is the correct explanation of assertion

Newton's rings are formed in reflected system and if the refractive index of the first medium is more than the second medium, there is no reversal of phase in reflected ray so, central fringe remains bright.