What is the range of the angles of the incident rays with the axis of the pipe for the following phenomena to occur. The outer covering of the pipe is made of a material of refractive index 1.44. (E) The following figure shows a cross-section of a ‘light pipe’ made of a glass fiber of refractive index 1.68. Then what will happen to the critical angle of diamond- liquid interface as compared to critical angle of diamond -water interface? (D) A diamond is immersed in such a liquid which has its refractive index with respect to air as greater than the refractive index of water with respect to air. (C) In an optical fibre, if n1 and n2 are the refractive indices of the core and cladding, then what will be the resultant equation? (B) A diver at a depth 12 m inside water (a μω=4/3) sees the sky in a cone of semi-vertical angle. (A) Which phenomena is prominently involved in the formation of mirage in deserts? This type of mirage is especially common in hot deserts.īased on the above facts, answer the following questions: Such inverted images of distant tall objects cause an optical illusion to the observer. The observer naturally assumes that light is being reflected from the ground, say, by a pool of water near the tall object. To a distant observer, the light appears to be coming from somewhere below the ground. a) A polished wooden table has a smooth surface thus, specular reflection will be observed.ī) Chalk powder has an irregular surface thus, diffuse reflection will be observed.Ĭ) Paper has an irregular surface at the microscopic level, thus diffuse reflection will be observed.ĭ) Marble floor with water will have a smooth surface thus, the specular reflection will be observed.Į) The unpolished side of a mirror has an irregular surface thus, the diffuse reflection will be observed.Ĭheck out: Telescope Case Study-based Question This creates a smooth surface now and we observe specular reflection instead of diffuse reflection.Īns. Normally the light rays are diffused due to the rough surface of the road but when the road is wet, water fills the irregularities present on the surface of the road. We experience difficulty in driving at night on a wet road because of the glare caused due to lights of vehicles coming from the opposite direction. Similar to the above example, if a gust of wind disturbs the water surface, the resulting waves and ripples would cause diffuse reflection. A piece of paper may look smooth on the surface to the naked eye, but at the microscopic level, there are tiny fibres that make it rough. The light which reflects off the water surface exhibits specular reflection.ĭiffuse reflection occurs when reflected rays travel in multiple directions off rough surfaces. This too happens as a result of specular reflection. On a number of occasions, we have seen photographs in which the photographer captures the reflection of the object in water. Specular reflection occurs from a calm lake because the surface is so flat that all the reflected rays bounce off in the same direction. It also occurs because of other smooth surfaces like glossy tabletops, car windows, and still water surfaces. Specular reflection is most commonly known as the kind of reflection we get from a mirror. Read also: Reflection of Light by Spherical Mirrors
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