railway RRB Technician Grade 3 Mock Test 2024 General Science Physics Optics

ଏକ ଗୋଲାକାର ଦର୍ପଣର ପ୍ରତିଫଳିତ ପୃଷ୍ଠର ବ୍ୟାସକୁ ________ କୁହାଯାଏ  । 

1
ଫୋକସ୍
2
ଆପର୍ଚର୍
3
ମୁଖ୍ୟ ଅକ୍ଷ
4
ପୋଲ
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