Teaching DSSSB TGT Mock Test 2025 General Science Physics Wave

ଏକ ଉତ୍ତଳ ଦର୍ପଣର ଫୋକଲ ଲମ୍ବ କ'ଣ ଯାହାର ବକ୍ରତାର ବ୍ୟାସାର୍ଦ୍ଧ 40 ସେମି ?

1
20 ସେ.ମି.
2
40 ସେ.ମି.
3
80 ସେ.ମି.
4
ଅସୀମତା 
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