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amberWhen passing through a lock, an amber light means “approach the lock under full control."
Amber
Light winds means having a intercourse while passing some gas
Reflection means complete change in path when light strikes a mirror and refraction means bending of a ray of light when passing from on medium to another.
Opaque basically means that something is not transparent; light can not pass through. For an example: the choroid of the eye is opaque, it absorbs excessive light so multiple images do not appear on the retina. Keep in mind that absorbing light is not the same thing as passing through. The choroid basically stops too much light from hitting the retina.
amberWhen passing through a lock, an amber light means “approach the lock under full control."
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When passing through a Lock an amber light means approchthe lock under full controll
A flashing amber light means approach the lock at a safe speed and under full control.