Two coherent light beams, one with intensity l, and the other with intensity 9 l. They interfere with each other on the screen. At a point where the phase difference between the two beams is 180°, show the intensity of the combined beam in terms of lo
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- Lenses often contain thin coatings to reduce reflections and UV radiation. Explain how this works.Fiber optic cables, such as those used for high speed communication (Internet & phone services), transmit signals as light pulses through transparent cables. When viewed from one of the ends, you can see these light pulses, but when viewed from the side you can't. Why does this happen?Light bends on entering glass from air because its ……...is less in the glass.
- The speed of light in crystal is 1.4 x 108 m/s. Calculate the refraction angle when a light ray in air is incident onto the crystal at 36 degrees.(Give your answer in degrees but don't include the units.)Ray optics is based on the assumption that light travels in a straight line. Diffraction effects (observed when light propagates through small apertures/slits or around small obstacles) disprove this assumption. Yet the ray optics assumption is so commonly used in understanding location and several other properties of images in optical instruments. What is the ustification?Fig. 1 shows a laser beam incident on a piece of wet filter paper placed on a glass plate whose 'refractive indexglass plate whose refractive index is to be measured (the rays are represented in the figure). Explain what happens anddeduce an expression for ni in terms of R and d. Consider the refractive index of air to be 1.Note: Remember that all light that falls on a reflecting surface always has part of the light reflected, being refracted or not.refracted or not. Moreover, θc in the figure represents the critical angle at which we have the condition of total internal reflection
- The index of refraction for violet light in silica flint glass is ny=1.68, and that for red is ng= 1.55. What is the angular dispersion of visible light passing through a prism of apex angle A= 59°, when the angle of incidence is 430. ? State your answer to the nearest 0.001°Fiber optic cables, such as those used for high-speed communication (Internet & phone services), transmit signals as light pulses through transparent cables. When viewed from one of the ends, you can see these light pulses, but when viewed from the side you can't. Using your knowledge about reflection and refraction, explain how this might work. Is there some physical limitation where this might not work?