Which of the following statements is false? A. If the interferometer is perfectl

Question

Which of the following statements is false?

A. If the interferometer is perfectly aligned, all the incident light is reflected back to the source when the detector detects no light.

B. If the mirrors are slightly misaligned the camera detects bright and dark bands across the beam due to different path lengths across the beam.

C. If the light path to one mirror is blocked there is no change in intensity when a mirror is moved.

D. The light intensity changes from bright to dark if one mirror is moved 266 nm.

E. The light intensity changes from bright to dark if one mirror is moved 133 nm.

12. The figure below shows a Michelson interferometer. The source is a laser with wavelength 532 nm, and the detector is a camera which measures light intensity Mirror 2 Mirror Source Beamsplitter Detector Which of the following statements is false? A. If the interferometer is perfectly aligned, all the incident light is reflected back to the source when the detector detects no light. B. If the mirrors are slightly misaligned the camera detects bright and dark bands across the beam due to different path lengths across the beam C. If the light path to one mirror is blocked there is no change in intensity when a mirror is moved D. The light intensity changes from bright to dark if one mirror is moved 266 nm E. The light intensity changes from bright to dark if one mirror is moved 133 nm

Explanation / Answer

when a mirror is moved by distance d, path difference of 2*d is introduced.

when path difference is odd integral multiple of lambda/2

where lambda is wavelength,

then destctutive interference happens and dark fringes are observed

so to change from bright to dark,

one mirror has to be moved by lambda/4

given lambda=532 nm

so distance needs to be moved is 532/4=133 nm

so option D is false.

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