Frequency is a function of the energy level of the photon.
Changing the medium does not change that energy level.
When light enters a denser medium, its speed decreases due to interactions with the medium's particles. This change in speed causes the frequency of the light to remain constant but the wavelength to decrease, following the equation v = fλ, where v is the speed of light, f is the frequency, and λ is the wavelength.
Light enter the water base on the principle of refraction of wave,during this process light moves from a denser medium to a less denser medium leading to the change in wavelength of the light That, however true, is not an answer to the question. (VanZanten)
Light slows down when it enters a denser medium due to increased interactions with the molecules in the medium. This slowing causes the light waves to bend away from the normal line to maintain the same frequency and to obey the law of conservation of energy.
When waves enter a denser medium at an angle, they undergo refraction. This means the wave changes direction depending on the change in speed caused by the change in medium density. The angle of refraction depends on the angle of incidence and the refractive indices of the two media.
When light enters a denser medium than it was previously travelling in, the wavelength gets shorter because the speed of the light slows down: v=w/f where v is the velocity of a wave, w is the wave length, and f is the frequency. When light enters the new medium, f does not change but v decreases so w also decreases. Actually, the density of the medium is not accurate. The medium is not denser it just is "optically denser" which means it has a higher index of refraction. It has nothing to do with actual density, which is weight divided by volume.
The displacement is a peculiar state, due to the fact that this is one of the special situations in which energy is completely destroyed and conservation of energy does not take place; hence the phase change
The change in speed causes the light to bend. If it is travelling from an optically dencer to an optically rarer medium the ray will bend away from the normal. But if it is travelling from an optically rarer to an optically denser medium then it will bend towards the normal.
Light waves bend when they enter a new medium at an angle due to a change in speed caused by the change in the medium's refractive index. This change in speed results in a change in the direction of the light wave, a phenomenon known as refraction.
Frequency means how often the waves pass per second. If, for example, 1000 wave cycles (wave crests) are emitted per second, you would expect the 1000 wave crests to pass any point - unless there are some special effects, such as the Doppler effect, when either the emitter or the recipient moves.
Nothing. The speed changes. We live in a universe where electromagnetic waves change frequency if they can't change speed (and in a vacuum they can't), and only change speed if they enter another medium like glass.
Light rays bend when they enter a new medium at an angle due to refraction, which is caused by the change in speed of light as it travels from one medium to another with a different optical density. This change in speed causes the light rays to change direction, leading to bending.
Refraction is the term that describes the notion that light rays bend when they enter a new medium. This bending occurs due to a change in the speed of light as it transitions from one medium to another, causing the rays to change direction.