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13 June, 15:43

When leaving a fish tank, a ray moving at 31.0 deg in glass (n = 1.50) exits into the air. At what angle does it enter the air?

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  1. 13 June, 16:00
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    Answer: 20 degrees

    Explanation:

    Given that the

    Refractive index n = 1.5

    Incident angle = 31 degree

    The refractive index formula is:

    n = sin I/sin R

    1.5 = sin 31 / sin R

    Make sin R the subject of formula

    Sin R = sin 31 / 1.5

    Sin R = 0.515 / 1.5

    Sin R = 0.343

    R = sin^-1 (0.34335)

    R = 20 degrees

    Therefore, it enters the air at angle 20 degrees
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