Light and Optics Question
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A light ray travels from air (n=1.00) into a glass block (n=1.50) parallel to the normal, i.e., the angle of incidence is 0°. Which of the following is true?
- The speed of light in the glass block is lower than in air.
- The light ray has an angle of refraction of 21°.
- The light ray is totally internally reflected.
- The speed of light in the glass block is higher than in air.