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(A) When light travels from a denser medium to a rarer medium, its speed increases $(v_2 > v_1)$.Since the frequency $(f)$ of the wave remains constan

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increases.

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(A) When light travels from a denser medium to a rarer medium, its speed increases $(v_2 > v_1)$.Since the frequency $(f)$ of the wave remains constant, the wavelength $(\lambda = v/f)$ also increases.The distance between successive wavefronts is equal to the wavelength.Therefore, as the wavefronts move from a denser medium to a rarer medium, the width (or spacing) between successive wavefronts increases.Thus, the correct option is $A$.

When wavefronts pass from a denser medium to a rarer medium, the width of the wavefront

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