The focal length of a lens of refractive index 1.5 in air, is 15 cm. When it is immersed…
Physics · JEE Main · NTA Exams — Optics
The focal length of a lens of refractive index 1.5 in air, is 15 cm. When it is immersed in a liquid of refractive index \(\frac{4}{3},\) then its focal length in liquid will be
- 240 cm
- 120 cm
- 60 cm
- zero
Answer
(C) 60 cm
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