# You asked: What will happen when a little water is introduced in between the plano convex lens and the plate?

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## What happens if we introduce water in between the lens and glass plate?

The light undergoes refraction and we get a refracted light. Also, the lens is kept horizontal on a glass slab which is responsible for reflection of light. These reflected and refracted lights due to that very small volume between the glass slab and lens behave as waves and hence undergo interference.

## What will happen if a few drops of transparent liquid are introduced between the lens and plate?

What will happen if a few drops of a transparent liquid are introduced between the lens and the plate? Ans. The fringes will contract, with diameter reduced by a factor of μ .

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## When the liquid is introduced between the lens and the plate in Newton’s Ringage the volume of raising a rise C remains the same d none of these?

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.

## Why do you put a thin glass plate at 45 degrees to the light source?

The angle between the incoming ray and the glass plate is 45 degree to make turns the light rays to 90 degrees and that’s why the rays fall normally on the plano-convex lens. Finally forms circular rings.

## What will happen if the lens is lifted slowly up the plate?

Answer. As the lens is lifted the difference in optical path between the two reflected rays will vary, thus slowly converting bright rings to dark and vice versa. This will be periodic change.

## What will happen if plano-convex lens is replaced by mirror in Newton’s ring experiment?

If we replace the glass plate with a mirror then, we will not get any interference fringe because the intensity of light reflected from the mirror will be so great that it won’t be visible and we will get uniform illumination.

## Why do the rings get closer and finer as we move away from the center?

Rings get closer as the order increases (m increases) since the diameter does not increase in the same proportion. In transmitted light the ring system is exactly complementary to the reflected ring system so that the centre spot is bright. … The wavelength of monochromatic light can be determined as, .

## What would happen to the ring if the space between lens and the plate is filled with a liquid of refractive index?

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.

## Why is the central spot is dark?

Why is the central fringe is dark? The central fringe in Newton’s rings is dark in the case of the reflected system because the air film thickness formed at the centre between the glass plate and the lens is zero. … But due to reflection, a path difference of (λ/2) is introduced.

## Why Newton’s rings are circular?

The path difference between the reflected ray and incident ray depends upon the thickness of the air gap between lens and the base. As the lens is symmetric along its axis, the thickness is constant along the circumference of a ring of a given radius. Hence, Newton’s rings are circular.