BANK EPFO SSA Mock Test 2023 General Science Physics Optics

What happens to the wavelength '位' and frequency '饾潅' of the light, when it propagates from聽rarer to denser medium?

1
Both 位 and 谓 increase
2
位聽increases, 谓 remains constant
3
位聽decreases, 谓 remains constant
4
Both聽位聽and 谓 decrease
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