Explanation

(a) Ageostrationary satelite: is an artificial satellite whose period of revolution is equal to the period of rotation of the Earth. 

OR

A satellite whose period of revolution is equal to 24 hrs/ 1 day.

(b) Types of lasers

i. Gas

ii. Solid state

iii. Semi-conductor

iv. Liquid

v. Chemical

vi. Fibre

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