20. Fig. 10.1 illustrates the energy into and out of a machine. useful energy output U
input energy I
machine
wasted energy W
Fig. 10.1
(a) Write an equation that links I, U and W.
(b) Which of these three quantities needs to be as low as possible in order to keep the
efficiency of the machine as high as possible?

anchor = archer //

as we probably am aware that our atmosphere or air have various levels, each level has different gasses, and each gas has another porousness. at the point when the light originates from lower porousness to higher penetrability, it alters its course. with the goal that implies that when the light originates from the moon to the earth, it alters it's course a lot more occasions. it essentially implies that the state of the light piece of the moon is changed on the earth.

not copied too! hope this !

joke:

h o h o hope you have a merry christmas!

snell's law

refractve index = sin incidence / sin refraction