Reflection from rough surfaces, such as asphalt, paper and clothing are examples of diffuse reflection. In diffuse reflection, light rays are scattered randomly at different angles from the reflecting surface.Know More
Ideal diffuse reflection results in equal luminance in all directions at the half-plane adjacent to the surface. This ideal form of diffuse reflection is called Lambertian reflectance. Such ideal reflecting surfaces are hypothetical, and actual reflecting surfaces are anisotropic, reflecting more in certain directions than in others. Surfaces with a high degree of diffusive efficiency include plaster, paper, white marble and talcum powder.
Specular reflection is exhibited by a mirror or a calm water surface, where coherent incident light rays are coherently reflected according to the law of reflection. The incidence angle and the reflected angle are equal in perfectly specular reflection. All reflection obeys the law of reflection, but diffuse reflection results in scattering because the reflection angles from each part of the material are different due to the random orientation of the surface.
Even slight surface imperfections make perfect specular reflection impossible, so any reflection from a real surface will always be some combination of diffuse and specular. Diffuse reflection is used form ambient lighting applications, such as frosted glass bulbs, while specular reflection is used for optical applications, such as microscopes and telescopes.Learn more about Optics & Waves
A common example of diffraction of light is looking at an object that is partially immersed in water, where the object appears to be in a different place. Sound diffraction is usually not visible, but it is audible through walls or other solid objects.Full Answer >
Music, speech and explosions are all examples of sound waves. Sound waves are mechanical vibrations in a compressible medium. The larger the amplitude of the waves, the louder the wave sounds. Because mechanical vibrations require a medium to vibrate, sound does not manifest in vacuums, such as space.Full Answer >
The moon and Earth are examples of non-luminous objects. Non-luminous objects become visible only when they reflect light produced by a luminous object. A luminous object, such as the sun, emits its own light, because it has its own source of energy.Full Answer >
Some examples of radiating infrared waves are burning charcoal, heat from an electric heater, fire or a radiator emitting warmth. Infrared radiation is a type of electromagnetic radiation that objects emit when they are hot but not quite hot enough to emit visible light. Because infrared radiation can be felt in the form of heat, it is also called thermal radiation.Full Answer >