The given image shows a measuring instrument.On the main scale of this instrument, the purpose of markings above and below the zero mark is to measure theI. depth.II. height.III. thickness.
Correct answer: A. I only
- A. I only
- B. III only
- C. I and II
- D. II and III
Explanation
A spherometer is a precision instrument primarily used to measure: * The radius of curvature of spherical surfaces, such as lenses and mirrors. * The thickness of small plates or objects. * The depth of depressions in a surface.The purpose of the markings above and below the zero mark on the main scale of a spherometer is to measure the vertical displacement of the central screw relative to the plane formed by its three outer legs.
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