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How is a spherometer used?
A spherometer is an instrument used for the precise measurement of the radius of curvature of a sphere or a curved surface. Originally, these instruments were primarily used by opticians to measure the curvature of the surface of a lens.
How do you use a spherometer Class 11?
Place the spherometer on the convex surface so that all the three legs rest on it. Turn the screw gently downwards till it touches the convex surface. Let a be the reading taken from the circular scale which is in line with the vertical scale. Now remove and place the spherometer on the plane mirror.
On what principle does a spherometer work?
A spherometer works on the principle of the micrometer screw. It is used to measure either very small thickness of flat materials like glass or the radius of curvature of a spherical surface thus getting its name.
What is the formula used to find the radius of curvature using spherometer?
The radius of curvature of a concave mirror measured by a spherometer is given by R=6hl2+2h. The measured value of l is 3cm using a meter scale with least count 0.
How many scales are there in spherometer?
The pitch of a spherometer is 1 mm and there are 100 divisions on its disc. It reads 3 divisions on the circular scale above zero when it is placed on a plane glass plate. When it rests on a convex surface, it reads 2 mm and 63 divisions on a circular scale.
What is pitch of a spherometer?
Why spherometer is called spherometer?
A spherometer basically is a precision instrument to measure very small lengths. Its name reflects the way it is used to measure the radii of curvature of spherical surfaces.
What is the pitch of spherometer?
1 mm
The pitch of a spherometer is 1 mm and there are 100 divisions on its disc. It reads 3 divisions on the circular scale above zero when it is placed on a plane glass plate. When it rests on a convex surface, it reads 2 mm and 63 divisions on a circular scale.
Does spherometer have zero error?
A spherometer does not have a zero error because the result obtained is by taking the difference between the final and initial reading.
What is the pitch of a spherometer give its value?
What is the LC of spherometer?
The Least count (LC) is the distance moved by the spherometer screw, when the screw is turned through 1 division on the circular. We are using a spherometer which has 100 divisions (N) on the disc. The least count can be calculated using the formula, The formula for the radius of curvature of a spherical surface.
What is the limitations of a spherometer?
Explanation: we can’t measure the radius of the curvature of the Earth with a spherometer. First, a normal spherometer is obviously much too small to measure the radius of the Earth . second, a very large spherometer would do the job just fine once you take several measurements to get an average.