Geometrical OpticsHard
Question
A ray of light is incident upon an air /water interface (it passes from into water at an angle of 45o. Which of the following quantities change as the lift enters the water ?
(I) wavelength (II) frequency (III) speed of propagation (IV) direction of propagation
(I) wavelength (II) frequency (III) speed of propagation (IV) direction of propagation
Options
A.I, III only
B.III, IV only
C.I, II, IV only
D.I, III. IV only
Solution
As speed of light in vacuum / air
π = Speed of light in medium
π =
⇒ velocity is different in different medium From v = nλ
But frequency is the fundamental property. It never change by changing the medium hence λ is also changed as v is change.
π = Speed of light in medium
π =
⇒ velocity is different in different medium From v = nλBut frequency is the fundamental property. It never change by changing the medium hence λ is also changed as v is change.
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