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What is crystal ?

Derive the formula of lense ? ​

Answer 1

Explanation:

What is a crystal simple definition?

A crystal is a solid whose molecules (or atoms) are arranged in a repeating pattern. ... Usually the fluid is a liquid but snow is crystals precipitated from air. Crystallization can be by freezing from a simple fluid or from a solution. Sometimes heat and pressure needs to be applied to a substance for crystals to form.

don't know 2nd question