1.

An equal-biconvex lens (μ=1.5) of focal length 20 cm is cut into two parts and placed in contact as shown in the figure. A liquid of refractive index 1.3 is filled between the two parts of lens. The equivalent focal length of the combination is

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An equal-biconvex lens (μ=1.5) of focal length 20 cm is cut into two parts and placed in contact as shown in the figure. A liquid of refractive index 1.3 is filled between the two parts of lens. The equivalent focal length of the combination is






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