What occurs as a ray of light passes from air into water?

Question

BlackTom AI · Accepted Answer

When light moves from air into water, its speed changes due to the different optical densities of the media. 
Option 1: 'The ray must decrease in speed' — This is correct because water has a higher refractive index than air, causing light to slow down as it enters the denser medium. 
Option 2: 'The ray must increase in speed' — This is incorrect; since water slows light compared to air, the speed cannot increase on entering water. 
Option 3: 'The ray must decrease in frequency' — This is false because the frequency of light remains constant when crossing a boundary; only the speed and wavelength change, not the frequency. 
Option 4: 'The ray must increase in frequency' — This is also false for the same reason: frequency stays the same across the boundary, so it cannot increase. 
In summary, the key effect at the air-to-water boundary is a reduction in speed (and wavelength) while frequency remains unchanged.

What occurs as a ray of light passes from air into water?Single choice

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