33. Geometric Optics

Refraction Of Light

Refraction of Light

Refraction Through Multiple Boundaries

 A light ray, moving in air, is incident on a piece of plastic at an angle of 23° with respect to the normal. Inside the plastic the ray travels at an angle of 16° with respect to the normal. What is the index of refraction of the plastic? 

 If oil is floating on water, what is the critical angle at the oil/water boundary? 

 Light shines from a laser in air down into water. If the laser beam in air makes an angle of <math display=“inline”><mrow><mn>40</mn><mo>&#x00B0;</mo></mrow></math> with the water’s surface, what angle will it make with the surface under water? 

 A graduated cylinder is filled with <math display="inline"><mrow><mn>14</mn><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">cm</mi></mrow></math> of oil floating on <math display="inline"><mrow><mn>20</mn><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">cm</mi></mrow></math> of water. How long, in nanoseconds, does it take light to travel from the top of the oil to the bottom of the water? 

 There is not enough information to answer this question. 

 Suppose a ray of light starts in air, then enters a slab of diamond with parallel faces, and then exits again. If the ray entered the diamond at an angle <math display=“inline”><mrow><msub><mi>&#x03B8;</mi><mtext>i</mtext></msub></mrow></math> from a line normal to the diamond slab, what is true of the final angle from normal <math display=“inline”><mrow><msub><mi>&#x03B8;</mi><mtext>f</mtext></msub></mrow></math>? 

Anderson Video - Refraction of Light

Refraction Explained

Snell's Law

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