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Units And Measurement

Question

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What is the formula to find out the radius of curvature of a spherical surface?

Solution

Radius of curvature of a spherical surface is given by,
$straight R space equals space fraction numerator straight l squared over denominator 6 straight h end fraction plus straight h over 2$
where,
l is average distance between the three fixed legs of spherometer, and
h is the height of the central screw above the plane surface.

Some More Questions From Units and Measurement Chapter

What is the need of measurement?

Define physical quantity.

Give four examples of physical quantities.

Define unit.

What are the two main required characteristics of a unit?

Can we use same units for different physical quantities?

Can we use different units to measure same physical quantity?

To measure a physical quantity X, the unit U is repeatedly used for n times. What is the magnitude of physical quantity?

Does the numerical factor in the quantitative measurement depend on the system of unit used?

Is one unit sufficient to measure a physical quantity?

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