White light is incident normally on a plane parallel thin film of µ=1.5. Find the minimum thickness of the film for which light of `lamda`=4000 Å is absent from the reflected light
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A parallel beam of light of wavelenght `560 nm` falls on a film of oil (refractive index `=1.4`). What should be the minimum thickness of the film so
Correct Answer - `100 mm`
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White light is incident normally on a glass plate (in air) of thickness `500 nm` and refractive index of `1.5`. The wavelength (in `nm`) in the visibl
Correct Answer - B For strong reflection. `2mut=(lambda)/(2),(3lambda)/(2),(5lambda)/(2).....rArr lambda=4mut,(4mut)/(3),(4mut)/(5),(4mut)/(7).....` `rArr 3000 nm. 1000 nm, 600 nm, 333 nm.` `rArr` only option is `600 nm`.
2 Answers 1 views
A parallel beam of white light falls from air on a thin film whose refractive index is `sqrt ( 3)` . The medium on both sides of the film is air. The
Correct Answer - 100nm
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A thin film having refractive index` mu" = 1.5"` has air on both sides. It is illuminated by white light falling normally on it. Analysis of the refle
Correct Answer - (a)900 nm (b)415nm ,491nm,600nm,771nm
2 Answers 1 views
A single ray traverses a glass plate (thickness = t) with plane surfaces that are parallel to each other. The emergent ray is parallel to the incident
Correct Answer - `d = t sin i[1-(cosi)/(sqrt(mu^(2)-sin^(2)i))]`
2 Answers 1 views
A thin film of thickness `4xx10^(-5)` cm and `mu`=1.5 is iluminated by white light incident normal to its surface. What wavelength in the visible rang
Correct Answer - 4800 Å
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With a thin air film between two points, 6 fringes appear when light of wavelength 5890 Å is used. Calculate the difference in the thickness of the fi
Correct Answer - 1.767 micron
2 Answers 2 views
White light is incident on a soap film at an angle of `sin^(-1(4)/(5))` and the reflected light on examination by the spectroscope shows dark bands. T
Correct Answer - `1.716xx10^(-3)`cm
2 Answers 10 views
A soap film of refractive index 4/3 and thickness `1.5xx10^(-4)`cm is illuminated by white light incident at angle `45^(@)`. The reflected light is ex
Correct Answer - n=7
2 Answers 2 views
A parallel beam of sodium light of wavelength 5896 Å is incident at angle `30^(@)`. Find the minimum thickness of the glass plate for which the transm
Correct Answer - `1.135xx10^(-7)`m
2 Answers 1 views