Draw a diagram to show the path of a ray of light travelling through an optical fibre - Leaving Cert Physics - Question e - 2009
Question e
Draw a diagram to show the path of a ray of light travelling through an optical fibre. (7)
Worked Solution & Example Answer:Draw a diagram to show the path of a ray of light travelling through an optical fibre - Leaving Cert Physics - Question e - 2009
Step 1
Draw a Diagram of the Optical Fibre
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Begin by drawing a rectangular shape to represent the optical fibre. This will illustrate the medium through which the light will travel. The rectangle should be positioned horizontally.
Step 2
Indicate the Entry Point of the Light Ray
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On the left side of the rectangle, draw an arrow pointing towards the rectangle to indicate the entry of the light ray into the optical fibre.
Step 3
Show the Path of the Light Ray Within the Optical Fibre
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Inside the rectangle, depict the light ray as a straight line that reflects off the interior surfaces of the optical fibre. The angle of incidence should be equal to the angle of reflection according to the law of reflection.
Step 4
Indicate the Exit Point of the Light Ray
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On the right side of the rectangle, draw an arrow continuing from the light ray to indicate that it exits the optical fibre.
Step 5
Label the Diagram
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Label the parts of the diagram for clarity. Write 'Optical Fibre' above the rectangle and 'Light Ray' along the path of the light ray to indicate what each part represents.
Step 6
Add Dimensions If Necessary
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You may include dimensions of the optical fibre or the angles of incidence and reflection if relevant, but ensure the overall diagram remains clear and easy to understand.
Step 7
Final Touches
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Make sure the diagram is neat, with clear lines, and ensure that the labels are legible and appropriately positioned.
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