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Question

The focal length of a convex lens of glass (μ=1.5) is 2cm. The focal length of the lens when immersed in a liquid of refractive index 1.25 will be :
  1. 5cm
  2. 2.4cm
  3. 1cm
  4. 4cm

A
2.4cm
B
5cm
C
4cm
D
1cm
Solution
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