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Why does the focal length of a lens increase when it is put in water?
Wiki User
∙ 14y ago
Yes. The refractive indexes of both materials ... the substance of which the lens
is made and the medium outside of the lens ... are both involved in the geometry
of the ray path.
Wiki User
∙ 11y ago
Wiki User
∙ 14y agoLight 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.
Wiki User
∙ 8y agoPower decreases
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How focal length of a lens change when apparatus immersed in water?
Yes , because when lens is deeped in water its R.I changes & hence focal length is increased
Whats the focal length of a lens?
The focal length of a lens is the distance from the principal foci to the center of the lens.
Length of a lens is the distance from the center of the lens to its principal focus?
It is called the focal length. It is equal to 1/2 times r, and is positive on concave mirrors and negative on convex mirrors.
What will happen to the focal length of a lens if it is cut into half vertically?
When the lens is cut vertically then the focal length of the lens will increase.the focal length will become approx double.
Does the focal length of a spherical mirror or lens change when placed under water?
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
How focal length of a lens change when apparatus immersed in water?
Yes , because when lens is deeped in water its R.I changes & hence focal length is increased
How do you find the new focal length when the lence is put in to the water?
to find the new focal length when the lens is put into water it becomes the 4 times the focal length in air.
Whats the focal length of a lens?
The focal length of a lens is the distance from the principal foci to the center of the lens.
Explain how the focal length changes as a convex lens becomes flatter?
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!
Length of a lens is the distance from the center of the lens to its principal focus?
It is called the focal length. It is equal to 1/2 times r, and is positive on concave mirrors and negative on convex mirrors.
Does the focal lens length have three classifications?
yes, focal lens length has three classifications
Will the focal length of a lens change when put in water?
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.
What is defined as the distance between a lens and its focal point?
focal length of the lens
What is the focal length of the convex lens?
The distance from the centre of the lens to the focal point.
What will happen to the focal length of a lens if it is cut into half vertically?
When the lens is cut vertically then the focal length of the lens will increase.the focal length will become approx double.
If a telescope has an objective lens of 3 inches what is the focal length?
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.
Does the focal length of a spherical mirror or lens change when placed under water?
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
