A thin Film thickness 132.5 nm with
Index
OF
refraction
OF
1.469 is
sandwhiched between two thick pieces
glass
with Index
of refraction of
1.732. Light is shon
film
Find
the shortest two wavelengths
which reflection
from the film
will be
the maximum

muscle endurance

explanation:

i can do 50 in a row ( but i get so tired after that)

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.