What is the physical principle that makes the frequency constant when light travels from one medium to another medium different from it in density?
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![What is the physical
principle that makes the
frequency constant when
light travels from one
medium to another medium
different from it in density?
optical.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fa1ef4034-0d44-4c82-88f2-c0bb0ad87215%2F4b1fbefc-45cd-4887-afde-53fba6d7ea81%2Fvlqwckr_processed.jpeg&w=3840&q=75)
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