Consider the circular interference pattern in Figure (b) caused by a thin film of air between a flat plate of glass and a curved lens as shown in Figure (a). The radius of the sixth dark ring (not counting the black dot in the middle) is 7.0 mm. The index of refraction of the glass is 1.5. Consider the wavelength of the light (in air) to be 644 nm P R O
Consider the circular interference pattern in Figure (b) caused by a thin film of air between a flat plate of glass and a curved lens as shown in Figure (a). The radius of the sixth dark ring (not counting the black dot in the middle) is 7.0 mm. The index of refraction of the glass is 1.5. Consider the wavelength of the light (in air) to be 644 nm P R O
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Transcribed Image Text:25-4 Consider the circular interference pattern in Figure (b) caused by a thin film
of air between a flat plate of glass and a curved lens as shown in Figure (a).
The radius of the sixth dark ring (not counting the black dot in the middle) is
7.0 mm. The index of refraction of the glass is 1.5. Consider the wavelength
of the light (in air) to be 644 nm
P
R
(a)
Determine the following:
(a) Radius of curvature of the lens.
m (± 2 m)
(b) Focal length of the lens.
m (± 2 m)
(b)
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