Light changes direction when it goes from one medium to another for two reasons. One is because it is a wave and other is because the light travels different speeds in the two mediums.
Light travels the speed c in vacuum and it travels the slower speed 3/4c in water and even the slower speed 2/3c in glass.
When the lens is in air the difference in speed is 2/3c versus c. When it is in water the difference in speed is 2/3c versus 3/4c. The difference in speed is smaller when it is in water and so the light bends less. The light bending less corresponds to a longer focal length.
A lens of short focal length has a greater power (than a lens of large focal length)
Yes , because when lens is deeped in water its R.I changes & hence focal length is increased
The focal length of a lens refers to the distance from the centre of the lens to the principal foci.
The focal length of a lens is the distance from the principal foci to the center of the lens.
to find the new focal length when the lens is put into water it becomes the 4 times the focal length in air.
When the lens is cut vertically then the focal length of the lens will increase.the focal length will become approx double.
Power is inversely related to the focal length. So convex lens of focal length 20 cm has less power compared to that having focal length 10 cm
More the thickness, less the focal length.
yes, focal lens length has three classifications
when the degree of convergence of a convex lens placed in air increases, we say its convexity has increased. as the power of a lens is the measure of degree of its convergence or divergence, we can increase the convexity of a lens increasing its powerthis is further achieved by decreasing its focal length.as focal length is inversly proportional to the refractive index of lens we have to decrease in order to increase its convexity.
The size (diameter) of a lens does not determine its focal length. The amount of curvature of the lens does. Citing a diameter for a lens doesn't help us find the focal length. Lenses are ground to specifications that allow short or long focal length. The more curved the lens, the shorter the focal length. You can see this if we specify a given curvature and then start to "flatten" the lens. The focal length will get longer and longer as the lens is flattened. When the lens is flat (has to curvature) the lense has an infinite focal length, just like a piece of flat glass.
focal length of the lens
The distance from the centre of the lens to the focal point.
The focal length of a lens is the distance from the center of the lens to the point at which it focuses light rays. The bigger the focal length, the more powerful the lens. ChaCha!
The eyepiece will have a shorter focal length than the objective lens has.
Not at all. The focal length is determined by the curvature of the surfaces.
i do not think so because a mirror an a lens is two same things except that mirrors can reflect the water and the lens may refract or bend the water so that can change the focal length between the mirror and the lens
The thicker the lens is, the shorter the focal length will be, and the bigger the image produced will be.
For a lens ... 1/image distance + 1/object distance = 1/focal length of the lens
A careful reading of the question raises the uncomfortable suspicion that it might be very difficult to put the focal length in water. However, it's quite possible to put the lens itself in water. When that's done, it's quite likely that the lens's focal length has changed. The refractive indexes of both materials ... the substance of which the lens is made and the medium around it ... are both involved in determining its focal length.
The focal point is the point where light converges after it passes through a concave lens. The focal length is the distance of the focal point to the lens. Same for a convex lens, except that the focal point is the imaginary point from where light deflected from lens seems to have emerged.
Basically, the focal length is the distance from the center of the lens to the focal point or the principal foci.The calculations will depend on the curvature of the lens, the lens thickness, and the refractive index of the material that the lens was made out of. Wikipedia has a great description of lens focal length, see the link to this article in the related link section below.
The focal length for a mirror is determined by the law of reflection from the mirror surface. This law is not governed by the material that the mirror is made by. This means that the focal length depends only on the radius and curvature. Conversely, the focal length of a lens depends on the indices of refraction of the lens meterial and the surrounding medium.
yes. By lens formula the relative refractive index will change. hence the focal lenght increases.
No. Because the medium remains the same and hence the lens' or mirrors' focal length doesnt change