Q.

In a calm pond, water μ=4/3 is filled uniformly upto 1 m depth. The maximum wavelength of the electromagnetic radiation indication incident normally from air onto the water surface, that will be strongly reflected is: [assume: nground > nwater]

Moderate

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By Expert Faculty of Sri Chaitanya

163m

83m

43m

8 m

answer is 2.

(Detailed Solution Below)

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Detailed Solution

Δ=2μt=2×43×1=83There are two phase reversal of π. One at the air water surface 8 another at the water-ground surface.∴ Condition for maximum interference will be Δ=nλ83=nλλ=83n λmax=83m

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