If light with a wide spectrum, such as white light, passes through an oval hole with dimensions of 400 nm x 700 nm, the resulting color would depend on the specific properties of the materials involved and the context in which the light is observed.
If the dimensions of the oval hole are comparable to or smaller than the wavelength of visible light (approximately 400 nm to 700 nm), the light passing through the hole would likely undergo diffraction and interference effects. These effects can lead to the separation of different colors or wavelengths of light, similar to what happens when light passes through a prism, causing dispersion.
In such a scenario, the resulting color observed would not be white or blue. Instead, it would likely be a dispersed spectrum of colors, potentially including various shades of red, orange, yellow, green, blue, and violet. The specific distribution of colors would depend on the precise details of the diffraction and interference patterns produced by the oval hole.
To determine the exact outcome, it would be necessary to consider the specific properties of the materials involved, the size and shape of the oval hole, and other factors that might affect the behavior of light passing through the hole.