b) A Fabry-Perot device contains two parallel part-reflective surfaces, each with a power re- flection coefficient R = 0.92, separated by an air gap of 40 μm. The device is used at a small but non-zero angle of incidence, such that there is a transmission maximum at wavelength 589 nm. Calculate the coefficient of finesse, and the resolving power. If a sodium lamp emits 2 spectral lines at 589.0 and 589.6 nm respectively, comment on whether these two lines can be resolved by the device.
b) A Fabry-Perot device contains two parallel part-reflective surfaces, each with a power re- flection coefficient R = 0.92, separated by an air gap of 40 μm. The device is used at a small but non-zero angle of incidence, such that there is a transmission maximum at wavelength 589 nm. Calculate the coefficient of finesse, and the resolving power. If a sodium lamp emits 2 spectral lines at 589.0 and 589.6 nm respectively, comment on whether these two lines can be resolved by the device.
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![b) A Fabry-Perot device contains two parallel part-reflective surfaces, each with a power re-
flection coefficient R = 0.92, separated by an air gap of 40 μm. The device is used at a small
but non-zero angle of incidence, such that there is a transmission maximum at wavelength
589 nm.
Calculate the coefficient of finesse, and the resolving power.
If a sodium lamp emits 2 spectral lines at 589.0 and 589.6 nm respectively, comment on
whether these two lines can be resolved by the device.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F2029e9ff-92ae-4d39-b219-1e9508720477%2F9544cc0c-6781-4967-9009-c8c0365c187b%2Fvridob_processed.jpeg&w=3840&q=75)
Transcribed Image Text:b) A Fabry-Perot device contains two parallel part-reflective surfaces, each with a power re-
flection coefficient R = 0.92, separated by an air gap of 40 μm. The device is used at a small
but non-zero angle of incidence, such that there is a transmission maximum at wavelength
589 nm.
Calculate the coefficient of finesse, and the resolving power.
If a sodium lamp emits 2 spectral lines at 589.0 and 589.6 nm respectively, comment on
whether these two lines can be resolved by the device.
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