Lab 4 Reflection-Refraction and Total Internal Reflection

B Q1/ If the star's distance from the earth is 4.640 x 105 km, how long will it take the light to travel from the earth to the star and back again? Q2/ A ray is reflected with 60° in the water. What is the incident angle in air? Q3/ Define: 1- Huygens Principle 2- Laws of Refraction 3- Fermat's Principle Q4/ A concave surface with a radius of 2cm is separated two media water and air. An object is located in the first medium at a distance of 10 cm from the vertex. Find the primary focal length. Good Luck Prof. Dr. Nidhal Jandow

7. What happens when the incident angle is greater than the critical angle? Please describe least two complete sentences. 8. This phenomenon is called Total Internal Reflection (TIR). What do you think would be some practical purposes of TIR in modern technology? Please name at least one example and explain your answer in at least two complete sentences.

Optical fiber systems are used in communication system to transmit telephone signals, internet communication and cable television signals. Using the refractive index in Table 1, design a fiber optic for a multimode transmission. a) Define the incident angle and critical angle for each boundary. b) Sketch and describe the optical fiber structure. c) Discuss the advantages and disadvantages of optical fiber communication system

The figure below show a slab made of three different materialS X, Y, and Z having refractive indices nx, ny, and nz respectively. The slab is immersed in water(n=1.333) and the light is incident upon its bottom surface. A. Rank the materials according to the refracted index of the materials, greatest first. B. Rank tge materials according to the speed of light in the material, fastest first. C. What would happend to the angle of y if material X and Y are swapped.

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Q5 Define the following terminologies: A) Total internal reflection. B) Isotropic medium. C) Optical density.

2 Which of the following is an INCORRECT generalization about light?*         Light should pass through at least two media with different densities for refraction to happen.       Incident angle must be less than the critical angle for total internal reflection to happen.       When visible light passes through an ideal filter, the intensity would be reduced.       When visible light travels from vacuum to a denser object, it will slow down.

1. What is the critical angle for total internal reflection of a crown glass that is immersed in water? In which direction must the light be going to have total reflection, water to glass or glass to water? 2. Why do diamonds sparkle? Explain.

help please

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Q1) a) Measure the incidence angle using the protractor, b) find the index of the second material, c) calculate the angle of refraction. d) draw the refraction Ray using the ruler and the protractor AIR LIQUID Speed of light in liquid = 1.6 X 10^8 m/s %3D

a) Explain the conditions necessary for total internal reflection of light at the interface between two media. (at least 50 words) b) Describe and explain the structure of an optical fibre. (at Least 70 words) Completed forms to be made available for external moderation. c) Complete the following ray diagrams of optical fibres accurately. Use a ruler and a pencil to show how the rays are reflected along the fibre. For each diagram, show the positions of the normal lines. Use a protractor to measure the angles of reflection accurately. A 00

Stephen is given a large crystal and needs to verify whether it is a diamond or cubic zirconia. He shines a beam of light at a 44.8 ° angle upon the face of the crystal and measures the refraction angle. Air What is the refraction angle if the crystal is a diamond? refraction angle for diamond = What is the refraction angle if the crystal is a cubic zirconia? refraction angle for cubic zirconia =

A swimmer looking directly down at a lamp at the bottom of a swimming pool observes that the lamp illuminates a circular region of the pool's surface. If the radius of the circular region of light is 2.5 m, how deep is the pool? (Hint: The index of refraction of water is 1.33)   a. 2.2 m   b. 2.8 m   c. 3.4 m   d. 2.5 m   e. 3.1 m

what happens to the ray of light (towards normal, away from normal, no refraction) as it passes through the curved surface of the glass in (a) example 1 (b) example 2. Explain. Assume that air is surrounding the glass.

The figure below shows a slab made of three different materials X, Y and Z having refractive indices nx, ny, and nz The slab is immersed in water (n=1.333) and the light is incident upon its bottom surface. a. Rank the materials according to the refractive index of the materials, greatest first. b. Rank the materials according to the speed of light in the material, greatest/fastest first. c. Discuss what would happen to the angle if material X and Y are swapped. d. If α=70.0ˆ and θ=50.0ˆ , what is the refractive index of material Z?

What happens to beams of light from planes out of the focal plane in a confocal microscope? A.) They are blocked and absorbed by the dichroic mirror. B.) They are never emitted since the confocal microscope prevents off-focus fluorescence emission. C.) They reach the detector but are then removed by the computer from the measurement of planes at several heights. D.) They hit the pinhole without reaching the detector.

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A swimmer looking directly down at a lamp at the bottom of a swimming pool observes that the lamp illuminates a circular region of the pool's surface. If the radius of the circular region of light is 2.5 m, how deep is the pool? (Hint: The index of refraction of water is 1.33) O a. 2.2 m O b.2.5 m O c. 2.8 m O d. 3.4 m O e. 3.1 m

An observer attempts to see a rainbow toward the end of a rainstorm when the sun shows through a break in the clouds. Which of the following conditions will not contribute to making the rainbow visible?   a. The observer must face the sun with his back to the rain clouds.    b. The observer must face the rain clouds with his back to the sun.   c. The light from the sun must reflect off the backs of the water droplets in the rain clouds at angles greater than the critical angle for total internal reflection.   d. The observer must be sufficiently far from the clouds to be able to see the color separation due to dispersion.   e. The index of refraction of any material, including water, must be frequency dependent.

a) Draw an equilateral prism and show the angle of minimum deviation. b) Write down the minimum deviation angle in terms of angles that light makes with the normal of the entrance and exit surfaces of the prism. (Use geometry) c) Write down the law of refraction to find n in terms of minimum deviation angle. D) How do we measure the angle of minimum deviation in a prism?

Q1/:light is incident from water onto the plane surface of flint glass at an angle of incidence of 35°. The index of refraction is 1.33 for water and 1.63 for flint glass (1) What is the angle of reflection of light off the flint glass? (2) Does the refracted ray bend * ?toward or away from the normal

x 10:30 PHY 206 LAB Ray Trac... PDF - 221 KB Purpose The purpose of this activity is to use the 3 special rays to determine the images created by lenses. Introduction The purpose of ray tracing is to create a geometrical viewpoint of the creation of an optical image using the principles of ray (geometrical) optics. If done to scale, we can determine the properties of the image (size, position, real or virtual, etc.) created by different optical elements. While all rays from a given point on an object are focused by a lens to a unique point on the image, there are special rays whose properties are easy to remember and draw. For lenses, there are three special rays: a. A ray initially parallel to the axis refracts through the far focal point. b. A ray that enters the lens along a line through the near focal point emerges parallel to the axis. c. A ray through the center of the lens does not bend. Draw the object as an arrow with its base on the axis. Draw the three special rays from the…

rds O D This is called Total Internal Reflection # The light ray should be bend away from the normal back internally into the water. At the critical angle the behaviour suddenly changes and the totality of all light is reflected Complete the table below (use air as the bottom material) TOP Material Water Glass Mystery A Refractive index (n) 1.33 1.52 critical angle,0c/º English (U.S.) Text Predictions: On EXTER 48 41.139 16 sin,0c Q Search 0.743 2. What equation can be used to calculate the critical angle 0.657 U I 1. What effect does increasing the index of refraction have on the critical angle? 18 1/ sin 0c 1.35 1.52 = Table Styles (10 10