BTS Opticien-Lunetier

BTS Opticien-Lunetier (France)

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A ray of light traveling in air (refractive index n₁ = 1.000) strikes the flat surface of a mineral crown ophthalmic glass lens (refractive index n₂ = 1.523) at an angle of incidence of 30.0°. According to the Snell-Descartes law of refraction, what is the angle of refraction inside the glass?

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