Physics Practicals Class 11

# Use of Spherometer

• Teach science experiments in a gamified way
• Boost conceptual clarity and knowledge retention
• Aligned with National Education Policy 2020
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• Engaging simulations with easy-to-teach instructions

• In this simulation, you will see how the spherometer works and how the dimensions of the given spherical surface are explained, providing a comprehensive understanding.
• Using the main and circular scale on the vernier callipers, you can accurately measure the radius of curvature of the given spherical surface while also calculating the distance between the legs of the spherometer with ease.
• Throughout the simulation, you will grasp the principle behind the spherometer and its various applications, enabling you to utilize it effectively in practical scenarios.
• At the end of this simulation, you will understand the different parts of the spherometer and their respective functions, allowing you to operate the instrument proficiently.

• Through this simulation, you can identify the common errors associated with spherometers and understand how to mitigate them, ensuring accurate measurements in your experiments.

### Simulation Details

Duration – 30 Minutes
Easily Accessible
Languages – Odia & English
Platforms – Android & Windows

Description

Spherometer
Spherometer is an instrument used for measuring the radius of curvature of spherical surfaces without errors in measurements. It consists of three legs upon which it balances and central screw which has the scale attached used to measure the radius of curvature. The three legs balance the spherometer upon the surface and the knob of the screw is turned to move the screw up and down to touch the top most part of curved surface.

Principle of the spherometer
The spherometer works on the principle of micrometre screw, which is based on the fact that amount of axial movement made by the screw can be accurately measured by the rotational movement of the screw.

The vertical distance moved by the central screw in one complete rotation of the circular disc scale is called the pitch.

Least count (L.C.) of spherometer
The least count of a spherometer is the distance moved by the spherometer screw when it is turned through one division on the circular scale.

Radius of curvature of spherical surface
The radius of curvature of a given spherical surface is given by,

where, R is the radius of curvature of spherical surface
l is the distance between the two legs of spherometer
h is the height of central screw above the plane of the circular section called sagitta.

### Requirements for this Science Experiment

• Spherical surface
• Sheet of paper
• Plane mirror
• Scale
• Pencil
• Paper strip

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