railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) General Science Physics Optics

ପ୍ରତିସରଣ କୋଣର ସାଇନ ସହିତ ଆପତନ କୋଣର ଅନୁପାତକୁ କ’ଣ କୁହାଯାଏ?

1
ସ୍ୱଚ୍ଛତା
2
ସ୍ୱଚ୍ଛ ସୂଚକାଙ୍କ 
3
ପ୍ରତିସରଣାଙ୍କ 
4
ଅସ୍ୱଚ୍ଛ
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