Correct option is A
The Reed type comparator is commonly used to measure small displacements of spindles. This type of comparator utilizes a series of reeds (thin flexible strips) arranged in a manner that amplifies small displacements. The displacement of the spindle is transferred to the reeds, which vibrate and indicate the movement on a scale. This type of comparator is particularly sensitive and accurate for measuring very small displacements, making it ideal for precise engineering and manufacturing processes.
