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Combinations of Lenses & Mirrors

In the Newton...

Question

In the Newton's rings set up, when a drop of water is introduced between the glass plate and planoconvex lens the observed ring system

A

Contracts

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B

Expands

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C

Remains the same

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D

Expands and then contracts

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Solution

The correct option is A Contracts
Since diameter of the ring is inversely proportional to the square root of refractive index of the medium between the planoconvex lens and plane glass plate, therefore as refractive index increases, diameter of the rings decrease, that is the rings contract.

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Similar questions

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

Q. 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?

Q. In a Newton's Ring experiment, the diameter of the

20^{t h}

dark ring was found to be

5.82 m m

10 t h

3.36 m m

. If the radius of the planoconvex lens is

1 m

, calculate the wavelength of light used

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.

Q. A drop of water of volume 0.05

c m^{3}

is pressed between two glass plates. as a consequence of which it spreads and occupies an area of 40

c m^{2}

. If the surface tension of water is 70 dyne/cm, find the normal force required to separate out the two glass plates in newton.

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