railway RRB Technician Grade 3 Mock Test 2024 General Science Physics

ଯଦି + 2.0D ରେ ଏକ ପ୍ରତିରୋଧକ ଲେନ୍ସର ଶକ୍ତି, ତେବେ ଏହା ହେଉଛି:

1
ଉତ୍ତଳ ଲେନ୍ସ
2
ଅବତଳ ଲେନ୍ସ
3
ଉତ୍ତଳ ଅବତଳ 
4
ଅବତଳ ଦର୍ପଣ 
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