Radius of curvature of each face of a bifocal lens made of glass of refractive index 1.5 is 30cm. Focal length of the lens is A) -30cm
B) -20cm
C) -15cm
D) zero
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Radius of curvature of each face of a bifocal lens made of glass of refractive index 1.5 is 30cm. Focal length of the lens is A) -30cm
B) -20cm
C) -15cm
D) zero
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