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The ratio of the velocity of light in a vacuum to that in a medium is the refractive index of a lens.
It is represented by n = c/v, where n = refractive index , v = characteristic speed and c = speed of light 299792 kmsec-1 or 1 Planck speed.
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∙ 13y ago
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What is the Nature of a convex lens immersed in a liquid with refractive index greater than of glass?
Usually a convex lens made up a material with higher refractive index would act as a converging device when kept in a medium having lower refractive index such as air. But when it is kept in a liquid as said with higher refractive index then convex lens would become as a concave lens. Now it would diverge the rays entering through it right from the liquid with higher refractive index.
Will the focal length of glass lens change when dipped in liquid of refractive index equal to glass?
Everything a lens does is the result of the change of refractive index at its surface.If the lens is surrounded by a medium with the same refractive index as the glass,then there is no refraction (bending) of light at the glass surface, and the lens is nolonger a lens. If you could find such a liquid, you might not even be able to see thatthere's a lens down there in it.
What determines the focal length of two sides of a lens?
Their radii of curvature and the refractive index of the material of the lens.
Under what condition a convex lens when placed in a medium behaves as an ordinary glass plate?
A lens works by the difference in refractive index between the material in the lens and the surrounding medium. So a lens put in a medium that has exactly the same refractive index would not be a lens, it wouldn't bend light at all.
A lens of glass is immersed in water. What will happen to its power?
The power of a lens depends on the differences in the refractive indices of the environment and the lens material. A glass lens immersed in water will loose power (a positive lens will focus at a greater distance). (This is for normal glass with refractive index greater than water - there could be glasses with refractive index less than water in which case the lens would gain power)
What is the relationship between radius of the lens and refractive index?
None. The radius of the lens depends on its shape, the refractive index depends on the material that the lens is made from.
What is the Nature of a convex lens immersed in a liquid with refractive index greater than of glass?
Usually a convex lens made up a material with higher refractive index would act as a converging device when kept in a medium having lower refractive index such as air. But when it is kept in a liquid as said with higher refractive index then convex lens would become as a concave lens. Now it would diverge the rays entering through it right from the liquid with higher refractive index.
Will the focal length of glass lens change when dipped in liquid of refractive index equal to glass?
Everything a lens does is the result of the change of refractive index at its surface.If the lens is surrounded by a medium with the same refractive index as the glass,then there is no refraction (bending) of light at the glass surface, and the lens is nolonger a lens. If you could find such a liquid, you might not even be able to see thatthere's a lens down there in it.
What determines the focal length of two sides of a lens?
Their radii of curvature and the refractive index of the material of the lens.
Under what condition a convex lens when placed in a medium behaves as an ordinary glass plate?
A lens works by the difference in refractive index between the material in the lens and the surrounding medium. So a lens put in a medium that has exactly the same refractive index would not be a lens, it wouldn't bend light at all.
A lens of glass is immersed in water. What will happen to its power?
The power of a lens depends on the differences in the refractive indices of the environment and the lens material. A glass lens immersed in water will loose power (a positive lens will focus at a greater distance). (This is for normal glass with refractive index greater than water - there could be glasses with refractive index less than water in which case the lens would gain power)
In which medium will a lens behave as a glass slab?
the medium which have the same refractive index as glass.
Can clay be used to make a lens?
No it is impossible to make lens from clay because it is completely opaque and has nil refractive index.
How do you use the lensometer or lens clock for finding the refractive index of a lens?
The formula for calculating a lens' refractive power is as follows:n = (D * R) + 1, where n = refractive power, D = optical power in diopter, and R = lens curvature radius.A lens clock will give you an estimated optical power, d and from there you can work out the curvature radius by using the formula:R = (0.53)/d.A lensometer will give you the actual optical power, D.Input the R and D into the first formula and you will get the lens' refractive index, n.
Why did Adolph Fick invent contact lens?
His work was based on early work, showing in theory how a lens with an appropriate curvature and refractive index could be overlaid on the cornea to provide refractive correction.
Why concave lens of large focal length is used to find refractive index of liquid?
physics
What is the refractive index of the cornea the aqueous humour and the lens?
1.376 for cornea，1.336 for aqueous humour
