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A "meridian"
frequency
That's called the frequency.
its the celestial sphere, Mr. Smith taught me that today, smart man!
A point has an infinite amount of lines passing through it.
Congruent
when there are more waves passing through the reference point in a period of time, which wave characteristic also increase
Perpendicular lines passing through a point are at right angles to each other.
when there are more waves passing through the reference point in a period of time, which wave characteristic also increase
17
A lens.
When it passes through optical centre.