vocabularys

1. Bioluminescence:light produced by living organisims                   

2.light ray:astraight-line beam of light as it trabels outward from its source      

3.law of reflection:the angle of an incoming light ray equals the angle of  the reflected ray











4.concave mirror:a mirror that curve in on the shiny side







5.conver mirror: a mirror that curves out on the shiny side





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