Question

if reflection takes place from a denser medium there will be a phase change of

Answer 1

When light is reflected off a more dense medium with higher index of refraction, crests get reflected as troughs and troughs get reflected as crests. The wave is said to undergo a 180 degree change of phase on reflection.

Answer 2

Question :

Choose the correct option :

If reflection takes place from a denser medium there will be a phase change of :

• zero
• π
• π/2
• π/3

Answer :

The correct answer is π.

When a wave is reflected from a denser medium , the wave is reversed in both of its directions and amplitude.

Hence , in the time domain , there is a change in phase of π .

Y = a sin (K c - ω t)

After reflection ,

Yr = - a sin (K c + ω t)

Thus ,

Phase difference is π.

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