- #1
darkar
- 187
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Here's the question,
A double slit experiment uses a helium-neon laser with a wvaelength of 633nm and a slit separation of 0.120 mm. When a thin sheet of plastic is placed in front of one of the slits, the interference pattern shifts by 5.50 fringes. When the experiment is repeated under water ( assuming the laser still works!) the shift is 3.50 fringes. Calculate
(a) the thickness of the plastic sheet and
(b) the index of refraction of the plastic sheet.
THere's some extra question I would like to ask, what exactly does that interference patter shift means? Less 5.5 fringes? or all of the fringes move by 5.5 fringes?
Thanks ~
A double slit experiment uses a helium-neon laser with a wvaelength of 633nm and a slit separation of 0.120 mm. When a thin sheet of plastic is placed in front of one of the slits, the interference pattern shifts by 5.50 fringes. When the experiment is repeated under water ( assuming the laser still works!) the shift is 3.50 fringes. Calculate
(a) the thickness of the plastic sheet and
(b) the index of refraction of the plastic sheet.
THere's some extra question I would like to ask, what exactly does that interference patter shift means? Less 5.5 fringes? or all of the fringes move by 5.5 fringes?
Thanks ~