# 1. The capacity of STM is limited to (a) 7 chunks (b) 7 + 2 chunks (c) 7 2 chunks (d) 7 + chunks 2..

In 1678 the Dutch physicist Christian Huyghens suggested
[contrary to the accepted theory that light was made up of tiny particles] that
light consisted of tiny waves. If it was made up of waves, there was no
difficulty about explaining the different amount of refraction of different
kinds of light through a refracting medium, provided it was assumed that light
traveled more slowly through the refracting medium than through air. The amount
of refraction would vary with the length of the waves: the shorter the
wavelength, the greater the refraction. This meant that violet light (the most
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In 1678 the Dutch physicist Christian Huyghens suggested
[contrary to the accepted theory that light was made up of tiny particles] that
light consisted of tiny waves. If it was made up of waves, there was no
difficulty about explaining the different amount of refraction of different
kinds of light through a refracting medium, provided it was assumed that light
traveled more slowly through the refracting medium than through air. The amount
of refraction would vary with the length of the waves: the shorter the
wavelength, the greater the refraction. This meant that violet light (the most
refracted) had a shorter wavelength than blue light; blue, shorter than green;
and so on. It was this difference in wavelength that distinguished colors to
the eye. And of course, if light consisted of waves, two beams could cross
without trouble. (After all, sound waves and water waves crossed without losing
their identity.) But Huyghens wave theory was not very satisfactory either. It
didnt explain why light rays traveled in straight lines and cast sharp
shadows, nor why light waves could not go around obstacles, as water waves and
sound waves could. Furthermore, if light consisted of waves, how could it
travel through a vacuum, as it certainly did in coming to us through space from
the sun and stars? What medium was it moving?

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