railway RRB Group D Mock Test Series 2024-25 General Science Physics Optics

20.0 ସେମି ବକ୍ରତା ବିଶିଷ୍ଟ ଏକ ଅବତଳ ଦର୍ପଣର ନାଭିୟ ଦୈର୍ଘ୍ୟ ହେଉଛି:

1
15 ସେମି
2
20 ସେମି
3
5 ସେମି
4
10 ସେମି
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