A Light Source Simultaneously Emits Light of Two Wavelengths,480 Nm

question 58

Multiple Choice

A light source simultaneously emits light of two wavelengths,480 nm and 560 nm,respectively.The source is used in a double-slit interference experiment where the slit spacing is a 0.040 mm,and the distance between double slits and the screen is 1.6 m.What is the separation between the m = 3 bright fringes of the two wavelengths as they appear on the screen? (1 nm = 10−⁹ m)

• A) 0.96 cm
• B) 0.48 cm
• C) 0.64 cm
• D) 0.16 cm

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