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  1.  
    2. 3:50 how hi=ho/n?
    3 years ago by Prem Mundhra

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  2.  
    3. why playback speed changing options is not given
    3 years ago by Subrat Panigrahi

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  3.  
    4. sir ,we take positive signs in the incident ray
    3 years ago by Anupam Singh

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  4.  
    5. sir is it necessary to use the geometrical convention for rays
    3 years ago by Anupam Singh

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