A Soap bubble has a thickness of 90 nm and its refractive index is `mu" = 1.4"`. What colour does the bubble appear to be at a point on its surface closest to an observer when it is illuminated by white light?
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Refractive index of glass for red and violet colours are 1.50 and 1.60, repectively. Find: a. The refractive index for yellow colour, approximately b.
(a) `mu_(Y) = (mu_(Y) + mu_(R))/(2) = (1.50+ 1.60)/(2) = 1.55` (b) `omega = (mu_(Y) + mu_(R))/(mu_(y) - 1) = (1.60+ 1.50)/(1.55 - 1) = 0.18`
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A lens behaves as a converging lens in air and a diverging lens in water. The refractive index of the material is (refractive index of water `=1.33`)
Correct Answer - D Lens changes its behaviour if `R`.`I`. Of surrounding becomes greater than `R`.`I`. Of lens. `mu_("lens")lt1.33`
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A biconcave lens made of transparent material of refractive index `1.25` is immersed in water of refractive index `1.33`. Will the lens behave as a co
`(1)/(f)=((mu_(i))/(mu_(s))-1) [(1)/(R_(1))-(1)/(R_(2))]` For concave lens `[(1)/(R_(1))-(1)/(R_(2))]=-ve` here `=1.25` `s=1.32` Then `((mu_(i))/(mu_(s))-1)=-ve` Then `(1)/(f)rarr(-ve)(-ve)` Thus it will behave like converging lens.
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The work done in blowing a bubble of volume `V` is `W`, then what is the work done in blowing a soap bubble of volume `2V` ?
Correct Answer - D As volume of the bubble `V=(4)/(3) pi R^(3) implies R = ((3)/(4pi))^(1//3)V^(1//3) implies R^(2) = ((3)/(4pi))^(2//3) V^(2//3) implies R^(2) prop V^(2//3)` Work done in blowing a soap...
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A soap flim of thickness `0.3 mu m` appears dark when seen by the refracted light of wavelength `580 nm`. What is the index of refraction of the soap
Correct Answer - 1.45 The path difference is `2mu t`. Now for destructive interface it can be `2mut=(lambda)/(2)` or `(3lambda)/(2)` or `(5lambda)/(2)` and so on……… `mu=(lambda)/(4 t),(3lambda)/(4 t),(5lambda)/(4 t)……..` `=(580xx10^(-9))/(4xx0.3xx10^(-6)) ,...
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A soap bubble of radius R = 1 cm is charged with the maximum charge for which breakdown of air on its surface does not occur. Calculate the electrosta
Correct Answer - `P=(1)/(2)epsilon_(0)E_(0)^(2)=39.6N//m^(2)`
2 Answers 1 views
Surface tension of a soap solution is T. There is a soap bubble of radius r. Calculate the amount of charge that must be spread uniformly on its surfa
Correct Answer - `8pir^(2)[epsilon_(0)(7P_(0)+(12T)/(r)]^(1//2)`
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What change must be placed on a soap bubble of radiuas 1.5 cm if the air pressure has to be the same inside and outside the bubble ? Assume the surfac
Correct Answer - `31.9xx10^(-9)c`
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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
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A convex lens of refractive index 1.5 is immersed in a liquid of refractive index (i) 1.6 (ii) 1.3 and (iii) 1.5. what changes happens to the focal le
Correct Answer - (i) - 8f (ii) `+3.25f` (iii) `oo`
2 Answers 1 views