Inevitable manufacturing imperfections in optical fiber leads to birefringence, which is one cause of pulse broadening in fiber-optic communications. Such imperfections can be geometrical (lack of circular symmetry), due to stress applied to the optical fiber and/or due to bending of the fiber.
Answer:
This is and ADDITION REACTION
Explanation:
Because your putting a compound and an element together
Answer:
because too much can neutralise the results