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Propably because it would be very difficult to measure the difference between the rings' diameters.

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Q: Why should radius of curvature of lens in newton's ring apparatus be large?
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Why should you use a convex lens of large radius of curvature in performing newtons ring experiment?

Radius of rings is directly proportional to the square root of the radius of curvature. Thin lens would have larger radius of curvature and hence the option


How get degree of curvature?

The degree of curvature measures how much a curve deviates from a straight line. It is commonly used in mathematics, engineering, and surveying. Two common methods are the circular curve method and differential geometry. The circular curve method determines the degree of curvature by measuring the central angle subtended by a 100-foot arc along the curve. The differential geometry approach calculates the curvature at each point on the curve and integrates these values to find the total degree of curvature. The specific method used depends on the field and context. Consult relevant resources or experts for detailed instructions.


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