Virtual Labs

Newton’s ring experiment: to determine the wavelength of light

When the plano-convex lens is replaced with a concave lens, what change would be observed in the Newton's rings?

a: The rings will become smaller and less distinct. Explanation

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b: The rings will shift outward and become larger. Explanation

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c: The rings will shift inward and become smaller. Explanation

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d: The rings will disappear completely. Explanation

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How can you experimentally determine the refractive index of the liquid by the Newton's ring experiment?

a: By measuring the diameter of the central spot Explanation

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b: By measuring the diameter of the nth dark ring Explanation

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c: By counting the number of colors of the rings Explanation

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d: By calculating the speed of light in the liquid medium Explanation

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How does the radius of curvature of plano-convex lens affect the Newton's ring pattern?

a: The rings will be of smaller diameter Explanation

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b: The rings will shift outward and become larger. Explanation

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c: The rings will become elliptical Explanation

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d: The rings will disappear completely. Explanation

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Which one of the following statements is correct about the pattern generated in Newton’s rings experiment?

a: Perfectly concentric and uniformly spaced Newton's rings indicate a wedge-shaped surface irregularity. Explanation

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b: Irregularly spaced and non-concentric Newton's rings suggest a surface with uniform thickness. Explanation

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c: Deviations in the pattern indicate localized irregularities or defects on the surface. Explanation

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d: Equally spaced and concentric Newton's rings reveal the presence of a non-uniform thickness distribution on the surface. Explanation

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What will happen if the air film between the plane surface and the convex surface in Newton's ring experiment is replaced by a liquid with a higher refractive index?

a: The interference pattern will disappear, and no rings will be observed Explanation

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b: The radius of the bright and dark rings will remain the same as in the air film. Explanation

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c: The interference pattern will change, and the radii of the bright and dark rings will be altered. Explanation

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d: The experiment will become invalid and cannot be performed with a liquid. Explanation

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