Light can't say transparent/opaque as you asked.its a wrong question.
i hope your question as to say the difference between these 3.
Based on the transmitting(means allowing to pass through it ) of light the objects are divided into transparent, opaque, translucent.
Objects vary in how they transmit light. Transparent objects allow light to travel through them.
Materials like air, water, and clear glass are called transparent. When light encounters
transparent materials, almost all of it passes directly through them. Glass, for example, is
transparent to all visible light.
Translucent objects allow some light to travel through them. Materials like frosted glass and
some plastics are called translucent. When light strikes translucent materials, only some of the
light passes through them. The light does not pass directly through the materials. It changes
direction many times and is scattered as it passes through. Therefore, we cannot see clearly
through them and objects on the other side of a translucent object appear fuzzy and unclear.
Opaque objects block light from traveling through them. Most of the light is either reflected by
the object or absorbed and converted to thermal energy. Materials such as wood, stone, and
metals are opaque to visible light.