The object is opaque
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That is called opacity. Objects that are opaque do not allow light to pass through them.
Objects that allow all light to pass through are called transparent objects. These objects have a clear and see-through quality, allowing light to travel through them without being obstructed or scattered. Examples include glass, clear plastic, and water.
Light usually passes through a transparent object. Similarly, light passes through the translucent objects but people cannot see through it.
Opaque objects, such as walls or clothing, can stop visible light from passing through them. Transparent objects, like glass or water, allow visible light to pass through with little obstruction. However, in some cases, certain materials can absorb or reflect visible light.
All forms of electromagnetic radiation travel through vacuums. No transmission medium is required. Some forms of EMR -- visible light, for example -- cannot pass through solid objects, however.
Light rays pass through window glass by a process called refraction. When light travels from air into glass, its speed decreases and the light bends towards the normal (perpendicular) to the surface. This bending of light allows it to pass through the glass and into the room.