engineering recuitment NPCIL Plant Operator Mock Test Physics Optics Refraction and Reflection

ଧଳା ଆଲୋକର ପ୍ରକୀର୍ଣ୍ଣନ ସମୟରେ, ___ ଆଲୋକ ସବୁଠାରୁ କମ୍ ବକ୍ର ହୁଏ । 

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ସବୁଜ 
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ବାଇଗଣୀ 
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ନୀଳ 
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