![]() ![]() Have a look at this a simulation of three ripple tanks, each containing an object of different width, which obstructs the propagation of a wave. Diffraction can be clearly demonstrated using water waves in a ripple tank. The amount of diffraction (spreading or bending of the wave) depends on the wavelength and the size of the object. Waves can spread in a rather unusual way when they reach the edge of an object – this is called diffraction. What is the reason for this? Do light and sound share any properties that might cause this effect? Diffraction Around An Object In headlights, Concave mirrors are in use to get the parallel beam of light.Have you ever wondered why you can hear someone who is round the corner of a building, long before you see them? It appears that sound can travel round corners and light cannot. Which kind of mirrors is in use in the headlights of vehicles and why?Īnswer. What do you understand by the power of a lens?Īnswer: The power of the lens is the ability of a lens to converge or diverge light rays. The refraction of visible light is also an important characteristic of lenses that enables them to focus a beam of light onto a single point. There are various phenomena, which are based on refraction such as the apparent bending of an object that is partially submerged in water, and the mirages observed in a hot, sandy desert. The incident ray, the refracted ray and normal ray at the interface of any two given medium, all lie in the same plane.The ratio of the sine of the angle of incidence and the sine of the angle of refraction is constant in any two given medium.This implies that denser the medium the slow is the speed of light, and vice versa. It determines the speed of a ray of light in the new medium. The Refractive index is the ratio of the angle of incidence to the angle of refraction. It refers to the shift in direction and speed of the beam of light waves, because of the change in the transmission medium. Refraction is the phenomenon of light, in which the wave is diverted when it passes diagonally through the interface between two media of different densities. Irregular reflection: Irregular reflection also termed as diffuse reflection, which occurs when the beam of light falls on the rough surface and reflects light in various directions. Regular reflection: Regular reflection is also termed as specular reflection, which occurs when the beam of light falls on a regular, polished, and smooth plane. The ray of incidence, the ray of reflection, and the normal drawn at the point of incidence, to the mirror, occurs on the same plane.The angle of incidence is identical to the angle of reflection.It changes the direction of the beam of light when it falls on the plane so that the ray goes back to the medium, in which it is generated. In simple terms, reflection implies the rebounding of light, sound, heat, or another object back to the source, without absorbing it. In refraction, the angle of reflection and angle of incidence are not the same.Īs we have seen the difference between reflection and refraction, let us now discuss some more details regarding reflection and refraction. The angle of reflection and angle of incidence is the same in the case of reflection. The angle of Reflection And Angle of Incidence The medium in which light propagates remains the same. The speed of light varies with the medium in which the ray undergoes bending. When a light ray strikes the boundary of a shiny surface the speed of light ray does not vary. In this process, light changes path i.e travels from one medium to another. In this process, light bounces back and returns back in the same direction. There are two forms of reflection, they are, Regular reflection (Specular reflection) and Diffused reflection. This occurs in transparent surfaces that allow bending of the ray to a different medium. Generally occurs on shinny surfaces that only allow rebounding of light without permitting penetration through it. ![]() Refraction is the bending of light rays when it travels from one medium to another. Reflection is the bouncing back of light when it strikes a smooth surface. The important difference between reflection and refraction: Parameters Difference between reflection and refraction
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