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HardNEET TEST
+4 / -1
An equiconvex lens of focal length f is made of glass with a refractive index μg = 1.5. It is cut into two thin identical plano-convex lenses by a plane perpendicular to the principal axis. The two halves are then rearranged as shown in figure and the space between them is filled with a thin layer of liquid of refractive index μl = 1.7. The new equivalent focal length of this combination is:
A
5f
B
−5f
C
2.5f
D
−2.5f

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