Suppose the electric company charges 10 fils per kw h. how much does it cost to use a 125 watt lamp 4 hours a day for 30 days? a) aed 1.20 b) aed i.80 c) aed 7.20 d) none of these e) aed 1.50

With the simplified model of the eye, what corrective lens (specified by focal length as measured in air) would be needed to enable a person underwater to focus an infinitely distant object? (be careful-the focal length of a lens underwater is not the same as in air! assume that the corrective lens has a refractive index of 1.62 and that the lens is used in eyeglasses, not goggles, so there is water on both sides of the lens. assume that the eyeglasses are 1.90