Question:
Newton's Rings are formed when a plano-convex lens of large radius of curvature placed on a plane glass plate is illuminated with monochromatic light.
Newton's Rings are formed when a plano-convex lens of large radius of curvature placed on a plane glass plate is illuminated with monochromatic light.
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Newton's rings are circular interference fringes produced by a thin air film.
Updated On: May 19, 2026
- Are examples of fringes of unequal thickness
- Are formed when a plano-convex lens of large radius of curvature placed on a plane glass is illuminated with monochromatic light
- Are parabolic fringes
- Are formed due to the phenomenon of diffraction
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The Correct Option is B
Solution and Explanation
Concept:
Newton's rings are interference fringes produced due to the thin air film formed between a plano-convex lens and a plane glass plate.
Step 1: Formation of air film.
When a plano-convex lens is placed on a plane glass plate, a thin air film of varying thickness is formed.
Step 2: Illumination by monochromatic light.
When monochromatic light falls on this arrangement, reflected rays from the top and bottom surfaces of the air film interfere.
Step 3: Nature of fringes.
The fringes obtained are circular rings, not parabolic fringes.
Step 4: Final answer.
Therefore, the correct statement is: \[ \text{Newton's rings are formed using a plano-convex lens on a plane glass plate.} \] \[ \therefore \text{Correct Answer is (B)} \]
Newton's rings are interference fringes produced due to the thin air film formed between a plano-convex lens and a plane glass plate.
Step 1: Formation of air film.
When a plano-convex lens is placed on a plane glass plate, a thin air film of varying thickness is formed.
Step 2: Illumination by monochromatic light.
When monochromatic light falls on this arrangement, reflected rays from the top and bottom surfaces of the air film interfere.
Step 3: Nature of fringes.
The fringes obtained are circular rings, not parabolic fringes.
Step 4: Final answer.
Therefore, the correct statement is: \[ \text{Newton's rings are formed using a plano-convex lens on a plane glass plate.} \] \[ \therefore \text{Correct Answer is (B)} \]
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