Acharge q = 2 μc is placed at the origin in a region where there is already a uniform electric field = (100 n/c) . calculate the flux of the net electric field through a gaussian sphere of radius r = 10 cm centered at the origin.
a) 2.26 × 105 n · m2/c
b) 5.52 × 105 n · m2/c
c) 1.13 × 105 n · m2/c
d) zero

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

Exercise 2. find the wavelength of a photon emitted when an electron jumps from the n = 3 energy level down to the n = 2 energy level. where is this photon in the electromagnetic spectrum?

What is the role of lenses in microscopy?