When waves of light pass from air to glass, then which phenomena will be affected?

When light waves pass from air to glass, two main phenomena are affected: wavelength and velocity. The correct answer is [D] Only wavelength and velocity. The frequency of the light wave, which determines its color, remains constant because it is determined by the source emitting the light. However, as light enters a medium like glass with a higher refractive index than air, the wavelength of the light wave decreases. This change occurs because the speed of light in glass is slower than in air, causing the wavelength to shorten. Additionally, the velocity of light decreases in glass due to its denser molecular structure compared to air. Option A is incorrect because the shape of the wave front remains unchanged, and only the wavelength and velocity are affected. Option B is incorrect because the frequency remains constant. Option C is incorrect because only the wavelength and velocity change, not the frequency. Therefore, when light passes from air to glass, the phenomena affected are primarily wavelength and velocity (option D).