Hi there,
At any given instant all the points of wavefront act as a secondary source of light. The waves generated by these secondary sources have light of wavelengths frequency and velocity. They make their own wavelets. Finally the common tangent envelopes overall wavelets gives secondary wavefront.
Hope it helps!
Question : The subject of the study of macroeconomics is based on which principle?
Option 1: The principle of national income.
Option 2: The principle of consumer.
Option 3: The principle of producer.
Option 4: The principle of investment.
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