Basic General Knowledge
When light passes from air into glass it experiences change of

frequency, wavelength and speed
frequency and speed
frequency and wavelength
wavelength and speed

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Basic General Knowledge
Free market is

ports that are exempted from payment of customs duty on articles of commerce, primarily to encourage tourism
a condition in the international market where nations do not impose customs duty or other taxes on import of goods
None of these
market where the price of a commodity is determined by free play of the forces of supply and demand

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