Question

The optical pins must stand ___ during light experiment

Answer 1

The answer is

Steady

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Answer 2

The optical pins must stand erect during light experiments.

Optical pins are used while performing light experiments to prove different laws pertaining to optics such as laws of reflection, laws of refraction, etc.

These are used to mark the points of the incident ray and then align the reflected ray accordingly by placing the pins in their proper places by mere observation.