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    encore_25's Avatar
    encore_25 Posts: 1, Reputation: 1
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    #1

    May 11, 2009, 07:03 PM
    Grade 11 physics
    Hello everyone, I am currently taking grade 11 U physics. We are doing a lab (Refraction and Critical Angles) and I have no clue what two questions are asking for!! I just need help understanding the question!!!! Here are the questions:

    1) Compare the Ѳc (theta) found experimentally against the Ѳc (theta) using the formula and actual values of n2 & n1. Comment on possible sources of error in this lab.

    2) Describe an application of critical angle / total internal reflections.
    Perito's Avatar
    Perito Posts: 3,139, Reputation: 150
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    #2

    May 11, 2009, 07:56 PM

    The critical angle is the angle that a light ray strikes a surface so that total internal reflectance occurs. That's what you determined. Read this.

    Total internal reflection - Wikipedia, the free encyclopedia
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #3

    May 12, 2009, 10:33 AM

    The errors may be that you have a protractor which is not properly scaled, the light source moved between readings, the glass block moved and so on.
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