9. A tank holds a layer of oil, 1.43 m thick, that floats on a layer of syrup that is 0.64 m thick. Both liquids are clear and do not intermix. A ray originates at the bottom of the tank at the
intersection with a vertical axis. It crosses the oil-syrup interface at a point 0.90 m from the
axis, then continues through the oil. It arrives at the oil-air interface at a distance 2.00 m from
the axis and at the critical angle. What is the index of refraction of the oil?
air
2.00 m

scattering of light by tiny particles in air to produce the colors we see on sky, is dependent on the following factors:

(i) wavelength of light

(ii) size of the scattering particle  

(iii) distance traveled by light through the atmosphere.

according to rayleigh's law of scattering, the amount of scattering is inversely proportional to the fourth power of its wavelength. shorter the wavelength, greater is its scattering. hence violet/blue light is scattered more than red.

sun's light is a composite light ( visible light) with wavelengths in the range 400 nm (violet) to 700 nm (red). as sunlight passes through our atmosphere, the molecules of air scatter light according to their wavelengths. during sunrise and sunset, the sun's position is below the horizon. hence light from the sun travels a greater distance in the atmosphere when compared to its position a noon.

as sunlight enters the earth's atmosphere, blue light is scattered away and at the end of its journey in the sky, only red and orange wavelengths remain in the beam.

hence at sunrise and sunset, the sky appears reddish orange.

if the person is shown to have +90n, then ans is -10n.

if the person is shown to have -90n, then ans is +10n.

the components of a vector are the parts of the vectors that are to each other.

b perpendicular