24. A beam of light of wavelength 550 nm, traveling in air, is incident on a slab of transparent material. The incident beam makes an angle of 60° with the normal, and the refracted beam makes an angle of 30.0° with the normal. Find the index of refraction of the material.
(A) 1.21
(B) 1.53
(C) 2.52
(D) 1.73
(E) 2.73

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