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Combinations of Lenses & Mirrors

Newton's ring...

Question

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. Why?

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Solution

This is because the reflections in these cases will be from a denser medium to a rarer medium and the two interfering rays are reflected under similar conditions.

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Q. 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.

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' and its refractive index is

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Q. When a drop of water is introduced between the glass plate and plano-convex lens in Newton's rings system, the ring system

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