The question at the end 1 experiment
. When the beam parallel to the principal axis hits a reflector surface concave surface, and โค้งนูน Light will reflect the same? How
.Different radiation reflected from the reflection curve is convergent if it inside and combination a point, but the radiation reflected from the reflection arc outside are spread apart.
2.Point radiation reflected from the inner arc of sheet metal together called
focus or focal point
.
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