Physics
When light passes from a denser medium to a rarer medium, its wavelength :
- decreases
- increases
- remains the same
- none
Refraction Plane Surfaces
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Answer
increases
Reason — The speed of light differs in different mediums due to their varying optical densities. In denser mediums, light travels slower, while in rarer mediums, it travels faster. According to the equation c = λ × f, where c is the speed of light, λ is the wavelength, and f is the frequency, if the speed of light decreases (as it does when entering a denser medium), and f remains constant, then λ must increase to compensate. Conversely, when light from a denser medium enters a rarer medium, its speed increases, and hence, its wavelength increases as well.
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Which of the following is correct when a ray of light passes from a rarer medium to a denser medium:
(1) speed will decrease
(2) frequency remains unchanged
(3) wavelength will decrease
(4) intensity will decrease- (1)
- (1) and (4)
- (1), (2) and (4)
- all of the above