Light travels a certain distance in water in `3 mu` s . How much time it would take for light for travel the same distance in air ? Refractive index of water = 4/3.
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A body has to travel 120km distance. It travels first 30km with uniform speed 30km/hr. Its average speed is 60 km/hr. What should be its speed in next
Average speed `=("total distance")/("total time")rArr60=(120)/(t)rArrt=2hr` time taken to cover first 30km `=(30)/(30)=1hr` time taken to cover next 90km =1hr So that speed in this duration `=(90)/(1)`=90 km/hr
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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`.
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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
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An equilateral prism is made of glass whose refractive index for red and violet light is 1.510 and 1.550 respectively. White light is incident at an a
Correct Answer - `5^(@)`
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The refractive index of glass with respect to water is `1.125` . If the speed of light in water is `2.25 xx 10^(8) ms^(-1)` , what is the speed of lig
Correct Answer - `2.0 xx 10^(8) ms^(-1)`
2 Answers 2 views
The speed of light in air is `3 xx 10^(8) ms^(-1)` . If refractive index of glass is 1.5 , find the time taken by light to travel a distance of 10 cm
Correct Answer - `5 xx 10^(-10) s`
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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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Light passes symmetrically through a `60^(@)` prism of refractive index 1.54. After emergence out from the prism the light ray is incident on a plane
Correct Answer - `0^(@)`
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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`
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