Virtual Labs

Determine the wavelength of sodium light by Newtons ring experiment.

1. What causes the formation of Newton’s Rings?

a: Diffraction of light Explanation

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b: Interference of light Explanation

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c: Reflection of light Explanation

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d: Refraction of light Explanation

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2. Why do Newton’s Rings have a concentric circular pattern?

a: Due to diffraction effects Explanation

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b: Because of the varying thickness of the air film Explanation

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c: Due to uniform reflection from the lens Explanation

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d: Because of the wavelength of light Explanation

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3. What is the condition for constructive interference in Newton’s Rings?

a: 2t = mλ Explanation

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b: 2t = (2m−1) λ/2 Explanation

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c: t = mλ/2 Explanation

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d: t = (2m+1)λ Explanation

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4. Why is the central spot in Newton’s Rings dark?

a: Due to destructive interference Explanation

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b: Due to constructive interference Explanation

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c: Because light does not reach the center Explanation

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d: Due to the absence of an air film at the center Explanation

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5. How does the wavelength of light affect the ring spacing in Newton’s Rings?

a: Larger wavelength increases ring spacing Explanation

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b: Smaller wavelength increases ring spacing Explanation

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c: Wavelength has no effect on ring spacing Explanation

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d: Ring spacing remains constant Explanation

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6. How does replacing air with a liquid in Newton’s Rings affect the ring pattern?

a: The rings become closer together Explanation

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b: The rings become wider Explanation

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c: The rings disappear Explanation

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d: The rings remain unchanged Explanation

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7. How is Newton’s Rings used to determine the wavelength of light?

a: By measuring the diameter of rings Explanation

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b: By counting the number of rings Explanation

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c: By using a diffraction grating Explanation

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d: By measuring the intensity of light Explanation

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8. Why are Newton’s Rings more distinct when using monochromatic light?

a: Monochromatic light enhances contrast Explanation

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b: Monochromatic light is brighter Explanation

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c: White light does not produce interference Explanation

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d: Monochromatic light has a shorter wavelength Explanation

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9. How does the radius of curvature of the lens affect Newton’s Rings?

a: Larger radius increases ring spacing Explanation

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b: Larger radius decreases ring spacing Explanation

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c: Radius of curvature has no effect Explanation

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d: Radius of curvature affects brightness only Explanation

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10. What happens if the light source is slightly tilted in Newton’s Rings experiment?

a: The rings become distorted Explanation

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b: The rings remain unchanged Explanation

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c: The rings disappear Explanation

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d: The rings become smaller Explanation

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