ଫୋକାଲ ଲମ୍ବ f (ବାୟୁରେ) ର ଏକ କନଭକ୍ସ ଦର୍ପଣ ଏକ ତରଳ ପଦାର୍ଥରେ ବୁଡିଯାଏ | ତରଳ  \(\left( {\mu = \frac{4}{3}} \right)\) ଦର୍ପଣର ଫୋକାଲ୍ ଲମ୍ବ ହେବ:

1
(4/3) f
2
(3/4) f
3
(7/3) f
4
F।

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