CHAPTER – 10 LIGHT-REFLECTION & REFRACTION Light is a form of energy‚ which enable us to see the object. In this chapter we will study the phenomena of reflection and refraction using the property of light i.e. straight line propagation (Light wave travel from one point to another‚ along a straight line). Reflection of Light When the light is allowed to fall on highly polished surface‚ such as mirror‚ most of the light gets reflected. normal Laws of Reflection 1. 2. The angle
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Light Effects Refraction‚ reflection and dispersion are all processes which happen when a ray of light is shone at either a glass block‚ a mirror or a prism. The ray box is the light source. Mirror When the ray box is shone at a mirror the angle of incidence is always a few degrees different to the angle of reflection. For example‚ if you shine a light ray into a mirror at 60* then it will reflect out at about 57*. Glass Block If I shine a light ray into a glass block then the light would
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glass using a glass block Principle and Hypothesis The Snell’s Law of Refraction says that – At the boundary between any two given materials the ratio of the sine of the angle of incidence and the angle of refraction is constant for any particular wavelength. The refractive index is determined by the formula – R = Sin i Sin r Where i = angle of incidence of the ray of light r = angle of refraction of the ray of light The refractive index of a medium gives the light
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This ’bending of a ray of light’ when it passes from one substance into another substance is called refraction. Glass is thicker and heavier than air. If the light slows down when it passes from the less dense air into the denser glass‚ this slowing down of the ray of light also causes the ray of light to change direction. It is the change in the speed of the light that causes refraction. This is a bit like when
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Baldeo Persaud NT1310 Unit 7 Assignment 1: Refraction‚ Reflection and Optics A good example of refraction of light and reflection of light is a rainbow. Sunlight enters the rain droplet at a specific angle and the rain droplet separates the white light into many different colors. This angle is a fixed measurement between your eye and the sun. What color is refracted depends upon the critical angle‚ which is the angle the sunlight strikes the back of the rain droplet. Red light bends the least
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There are two main aspects that influence a rainbow‚ and these include the altitude of the sun and the size of the raindrops (The Rainbow). The sunlight is refracted‚ which means the bending of light as it passes from one medium to another. This refraction makes different wavelengths‚ or colors‚ of the white light from the sun to separate. Determining whether or not the wavelengths will go through the raindrops or reflect always depends on the angle that
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Reflection is the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated. Common examples include the reflection of light‚ sound and water waves. The law of reflection says that for specular reflection the angle at which the wave is incident on the surface equals the angle at which it is reflected. Mirrors exhibit specular reflection. In acoustics‚ reflection causes echoes and is used in sonar. In geology
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. Physics Module Form 5 chapter 1 : Waves GCKL 2011 1.1 U N D E R S T A N D I N G W A V E S What is meant by a wavefront State the direction of propagation of waves in relation to wavefronts What is transverse wave? An imaginary line that joins all the points on the crest of a wave. The direction of propagation of a wave is perpendicular to its wavefront. A transverse wave is a wave in which particles of the medium oscillate in the direction of the propagation of the waves. Water
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Indian Railways (reporting mark IR) It is an Indian state-owned enterprise‚ owned and operated by the Government of India through the Ministry of Railways. It is one of the world’s largest railway networks comprising 115‚000 km (71‚000 mi) of track over a route of 65‚000 km (40‚000 mi) and 7‚500 stations. As of December 2012‚ it transported over 25 million passengers daily (over 9 billion on an annual basis). In 2011‚ IR carried over 8‚900 million passengers annually or more than 24 million passengers
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Final Exam Review Questions Multiple Choice Identify the choice that best completes the statement or answers the question. ____ 1. In the diagram‚ the amplitude of the wave is shown by: a. c c. b b. d d. a ____ 2. In the diagram‚ the crest of the wave is shown by: a. c c. b b. d d. a ____ 3. In the diagram‚ the trough of the wave is shown by: a. c c. b b. d d. a ____ 4. In the diagram‚ the wavelength is shown by: a. c c. b b. d d.
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