Define least count of an instrument

A screwgauage has pitch 1 . 5 m m and there is no zero error. Linear scale has marking at M S D = 1 m m and there are 1 0 0 equal division of circular scale. When diameter of a sphere is measured with instrument, main scale is having 2 m m mark visible on linear scale, but 3 m m mark is not visible, 7 6 t h division of circular scale is in line with linear scale. What is the diameter of sphere. A LASER is a source of very intense, monochromatic, and unidirectional beam oflight. These properties of a laser light can be exploited to measure long distances.The distance of the Moon from the Earth has been already determined very preciselyusing a laser as a source of light. A laser light beamed at the Moon takes 2.56 s to return after reflection at the Moons surface. How much is the radius of the lunar orbit around the Earth ?

This problem has been solved! You'll get a detailed solution from a subject matter expert that helps you learn core concepts. See Answer See Answer See Answer done loading Question:1. Define least count, and then determine the least count on the stopwatch on your phone. 2. Define measurements, and give an example. 3. Differentiate between accuracy and precision. 4. How can accuracy of a measurement be increased? 5. How can the precision of a measuring instrument be increased? 1. Define least count, and then determine the least count on the stopwatch on your phone. 2. Define measurements, and give an example. 3. Differentiate between accuracy and precision. 4. How can accuracy of a measurement be increased? 5. How can the precision of a measuring instrument be increased? Previous question Next question

• The least count of a measuring instrument is the smallest value in the measured quantity that can be resolved on the instrument's scale. • The least count is related to the precision of an instrument; an instrument that can measure smaller changes in a value relative to another instrument has a smaller least count value and so is more precise. • Any measurement made by the instrument can be considered repeatable to no less than the resolution of the least count. • The least count of an instrument is inversely proportional to the precision of the instrument. • For example, a sundial may only have scale marks representing the hours of daylight; it would have a least count of one hour. • A stopwatch used to time a race might resolve down to a hundredth of a second, its least count. • The stopwatch is more precise at measuring time intervals than the sundial because it has more counts (scale intervals) in each hour of elapsed time. • The least count of an instrument is one of the very important tools in order to get accurate readings of instruments like the vernier calliper and screw gauge used in various experiments. • Least count uncertainty is one of the sources of experimental error in measurements. • The least count of a vernier calliper is 0 . 02 m m and the least count of a micrometre is 0 . 01 m m .

Spherometer What is Spherometer? A spherometer is defined as An instrument that is used for precise measurements of the radius of curvature of either sphere or a curved surface. The first spherometer was invented by Robert-Aglae Cauchoix who was a French optician in 1810. These were primarily manufactured for the use of opticians in grinding lenses. Astronomers also used this instrument in grinding lenses and Spherometer Diagram Spherometer Working Principle The working principle of a spherometer is based on the micrometer screw. It is used for measuring with a small thickness of flat materials such as glass or for measuring the radius of curvature of a spherical surface. Parts of Spherometer A spherometer generally consists of a base circle of three outer legs, a central leg and a reading device. • A spherometer consists of a base circle of three outer legs, which is also known as the radius of the base circle, a ring with a known radius of the base circle. • The outer legs of the spherometer can be adjusted according to the inner holes. This is done to accommodate smaller surfaces. • The central leg can be moved in an upward and downward direction. • For taking the measurements, the reading device on the central leg should be moved. Principles of Operation If R is the radius of spherical material, then the mean length between two outer legs can be determined by using the formula: \(\begin \) Least Count of Spherometer Number of divisions on the circular scale = 100 Dista...