Athin flake of mica (n=1.58) is used to cover one slit of a double-slit interference arrangement. the central point on the wiewing screen is now ocupied by what had been the seventh bright side fringe before covering the slit with the mica. if the wavelenght of light is 550 nm, what is the thickness of the mica? remember that n is the index of refraction of the material given by: n=c/v, being v the speed of light through that material.

To develop this problem it is necessary to apply the optical concepts related to the phase difference between two or more materials.

By definition we know that the phase between two light waves that are traveling on different materials (in this case also two) is given by the equation

Where

L = Thickness

n = Index of refraction of each material

Wavelength

Our values are given as

Replacing our values at the previous equation we have

Therefore the thickness of the mica is 6.64μm

fgravity=10x10=100n case 1

fgravity=30x20=600n case 2

6 times more

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.