Transmission of Light Defined
Without visual light, there are no visual stories. Light moves as a wave, licking objects so we can like them. Without it, we'd be disgruntled. But, in physics, light can refer to any kind of electromagnetic wave: radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, or gamma rays. In metaphysics, light can refer to God, Allah, angels, anything at all that the enlightened have been struck by.
When you shine light on an object, a number of things can happen. Reflection is when light bounces off of a matte print. Specular reflection is when light reflects off a glossy print or plastic or Venetian glass. Diffuse reflection, however, is when light illuminates a dull object, like the dark haired security guard reading in the corner.
Light likes to keep moving, but it often stopped by obscurity. The best photo curators open the curtains to let the light in and ask visitors to remove their tinted glasses. Light transmittance is when light has successfully pierced a transparent, semi-transparent, or otherwise electromagnetically vulnerable object.