The focal length of a convex lens of glass $(μ = 1.5)$ is $2 c m$ . The focal length of the lens when immersed in a liquid of refractive index $1.25$ will be :

5 c m

2.4 c m

1 c m

4 c m

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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 :

The focal length of a convex lens of glass $(μ = 1.5)$ is $2 c m$ . The focal length of the lens when immersed in a liquid of refractive index $1.25$ will be :