A Laser Beam Passes Through a Thin Slit

question 41

Multiple Choice

A laser beam passes through a thin slit.When the pattern is viewed on a screen 1.25 m past the slit,you observe that the fifth-order dark fringes occur at ±2.41 cm from the central bright fringe.The entire experiment is now performed within a liquid,and you observe that each of the fifth-order dark fringes is 0.790 cm closer to the central fringe than it was in air.What is the index of refraction of this liquid?

• A) 1.33
• B) 1.40
• C) 1.49
• D) 1.62
• E) 3.05

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