Part A One of the beams of an interferometer passes through a small evacuated glass container 1.155 cm deep. When a gas is allowed to slowly fill the container, a total of 177 dark fringes are counted to move past a reference line. Calculate the index of refraction of the gas at its final density, assuming that the interferometer is in vacuum. The light used has a wavelength of 633.6 nm . (Figure 1) Express your answer using six significant figures. AEd ? ngas = 1.005070 Submit Previous Answers Request Answer X Incorrect; Try Again; 4 attempts remaining Provide Feedback Next > Figure 1 of 1 > To mirror M1 Glass container Source- Ms 1.155 cm M2What is the radius of curvature of the lens surface? Express your answer using two significant figures. A planoconvex lucite lens 3.6 cm in diameter is placed on a flat piece of glass as in the figure 34-18 in the textbook. When 600 -nm light is incident R = 12 m normally, 45 bright rings are observed, the last one right at the edge. Submit Previous Answers Correct Correct answer is shown. Your answer 11.87 m was either rounded differently or used a different number of significant figures than required for this part. Important: If you use this answer in later parts, use the full unrounded value in your calculations. Part B What is the focal length of the lens? Express your answer using two significant figures. IVO AEd ? f = 24.24 m Submit Previous Answers Request Answer X Incorrect; Try Again; One attempt remainingConstants | Periodic Table Part A Monochromatic light of variable wavelength is incident normally on a thin sheet of plastic film in air. The reflected light is a maximum only for 490.7 nm and 687.0 nm in the visible spectrum. What is the minimum thickness of the film (n = 1.58)? IVO AEd ? t nm Submit Request Answer Provide Feedback Next >