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

ଏକ ଲେନ୍ସର ପାୱାର କ’ଣ ଯାହାର ଫୋକାଲ୍ ଦୈର୍ଘ୍ୟ 1 ମିଟର ଅଟେ ?

1
1D
2
2D
3
3D
4
4D
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