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 in 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 >
Concave mirrors are used in car headlights, flashlights, telescopes, microscopes, satellite dishes and camera flashes. Dentists and ear, nose and throat doctors use concave mirrors during examinations to see a larger image of what they are examining. Concave mirrors are also used in solar-powered gadgets and visual bomb detectors.Full Answer >
The most commonly seen example of a convex mirror is the side view mirror on a car. Convex mirrors are seen in dome mirrors found in offices and stores for security and anti-theft purposes.Full Answer >
Examples of sound energy include sounds made by singing, whistling, musical instruments and horns. Sound is a vibration that causes a wave of pressure through air, water, wood and other mediums. It is heard when the wave reaches the ear and is perceived by the brain. Sound waves have characteristics including their frequency, amplitude, intensity, speed, direction and wavelength.Full Answer >