An object is situated to the left of a lens. a ray of light from the object is close to and parallel to the principal axis of the lens. the ray passes through the lens. which one of the following statements is true? (a) the ray crosses the principal axis at a distance from the lens equal to twice the focal length, no matter whether the lens is converging or diverging. (b) the ray passes through the lens without changing direction, no matter whether the lens is converging or diverging. (c) the ray passes through a focal point of the lens, no matter whether the lens is converging or diverging. (d) the ray passes through a focal point of the lens only if the lens is a diverging lens. (e) the ray passes through a focal point of the lens only if the lens is a converging lens.

car a and b are moving in opposite directions

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think its the third option

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.

i believe the answer is a hope it and is correct