Physics
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
Refraction Plane Surfaces
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Answer
all of the above
Reason — When a ray of light passes from a rarer medium to a denser medium, the speed decreases due to the change in the refractive index of the medium. Frequency remains constant due to the nature of light itself, whereas, wavelength decreases as a consequence of the change in speed. Intensity also decreases as part of the light ray suffers reflection.
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