Technology that helped Britain's Royal Air Force combat the German luftwaffe starting in the Battle of Britain
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Radar waves are too long to be seen.
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Yes. Radar was used on major warships by all the major powers at
some point during WW2. The US and UK had an advantage in that their
radar was developed and equipped earlier in the war.
The standard large warship radar for the US was CXAM.
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England developed the first radar scope to help defend against
the German air attacks in the 2nd world war.
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The original usage was RADAR since it is an acronym (RAdio Detection And Ranging) and people encountering it in written form may have thought it a typographical error were it not capitalized.
But now that radar has left the realm of esoteric physics and technology and entered the common man's vocabulary, it is usually seen in its lower-case form. At this time upper or lower-case usage depends on the preference of the user.