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no it is same
Wiki User
∙ 11y ago
Han Guel Bvautista
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∙ 11y agoLens meter
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Why is it possible to simplify the number of actual refractions in a lens down to one refraction at a central line through the optical centre?
There are a few reasons why it is possible to simplify the number of actual refractions in a lens down to one refraction at a central line through the optical centre. One reason is that when light passes through a lens, the lens refracts the light in such a way that the light is brought to a focus. The amount of refraction that occurs depends on the curvature of the lens and the index of refraction of the lens material. However, no matter how curved the lens is, the amount of refraction is always the same at the optical centre of the lens. This is because the optical centre is the point on the lens where the light rays passing through the lens are parallel to the principal axis of the lens. Another reason why it is possible to simplify the number of actual refractions in a lens down to one refraction at a central line through the optical centre is that when a lens is rotated about its optical axis, the image formed by the lens does not rotate. This is because the optical centre of a lens is invariant with respect to rotation. This means that it is not necessary to take into account the actual refractions that occur at different points on the lens when calculating the image formation by the lens.
Why is 100x microscope lens called oil immersion lens?
Because that lens (it does not HAVE to be a 100x lens - other lens magnifications are also available in oil immersion constructions) is made to be in contact with a drop of special oil which covers the specimen. The oil has the same index of refraction as the front lens glass and that way a different optical construction can be used.
Why do goggle lens does not have any power even when they are curved?
Goggle lenses don't have magnifying power because the front and back of the lens is curved the same. Lenses only have refracting (magnifying or size-reducing) power if the front of the lens is curved differently than the back of the lens. If the curvatures produce a lens that is thicker at the center than at the edges, then it will magnify. A lens that is thinner at the center than at the edges will be size-reducing.
How do you prove using snell's law that rays passing through the optical center of a thin lens are not refracted?
Let: medium1= medium where ray enters the lens medium2= inside the lens medium3= medium where the ray is refracted outside the lens From medium 1 to medium 2 which is the lens Snell's law: n1sin(alfa1)=n2sin(alfa2) (1) And from medium 2 to 3 : n2sin(alfa2)=n3sin(alfa3) (2) Then, from (1) and (2): n1sin(alfa1)=n3sin(alfa3) But n3=n1 (same medium), =>n1sinalfa1=n1sinalfa3 => sin(alfa1)=sin(alfa3) (4) Therefore, alfa1=alfa2 knowing that they are less than 90o. As a conclusion the incoming ray and the refracted ray passing through the optical centre are parallel.
What happens when rays of light incident on a lens and parallel to the principal axis of the lens converge?
-- The distance from the center of the lens to the plane in which the rays converge is the 'focal length' of the lens. -- If the rays emanated from one point on an object, then rays from all the other points on the object do the same thing, and a real image is formed.
What is optical center of a lens?
optic centre is the geometrical centre of the lens the rays of light passing through this point emerges in the same direction without bending.
What is called optical center of a lens?
optic centre is the geometrical centre of the lens the rays of light passing through this point emerges in the same direction without bending.
What is the distance from the center of earth to its center of mass?
The geometric center and the center of mass of the Earth are essentially the same point.
Why is it possible to simplify the number of actual refractions in a lens down to one refraction at a central line through the optical centre?
There are a few reasons why it is possible to simplify the number of actual refractions in a lens down to one refraction at a central line through the optical centre. One reason is that when light passes through a lens, the lens refracts the light in such a way that the light is brought to a focus. The amount of refraction that occurs depends on the curvature of the lens and the index of refraction of the lens material. However, no matter how curved the lens is, the amount of refraction is always the same at the optical centre of the lens. This is because the optical centre is the point on the lens where the light rays passing through the lens are parallel to the principal axis of the lens. Another reason why it is possible to simplify the number of actual refractions in a lens down to one refraction at a central line through the optical centre is that when a lens is rotated about its optical axis, the image formed by the lens does not rotate. This is because the optical centre of a lens is invariant with respect to rotation. This means that it is not necessary to take into account the actual refractions that occur at different points on the lens when calculating the image formation by the lens.
Why is 100x microscope lens called oil immersion lens?
Because that lens (it does not HAVE to be a 100x lens - other lens magnifications are also available in oil immersion constructions) is made to be in contact with a drop of special oil which covers the specimen. The oil has the same index of refraction as the front lens glass and that way a different optical construction can be used.
What is the positive lens is the same as?
The focal point F and focal length f of a positive (convex) lens, a negative (concave) lens, a concave mirror, and a convex mirror. The focal length of an optical system is a measure of how strongly the system converges or diverges light.
Why do goggle lens does not have any power even when they are curved?
Goggle lenses don't have magnifying power because the front and back of the lens is curved the same. Lenses only have refracting (magnifying or size-reducing) power if the front of the lens is curved differently than the back of the lens. If the curvatures produce a lens that is thicker at the center than at the edges, then it will magnify. A lens that is thinner at the center than at the edges will be size-reducing.
How is a microscope an example of a technological design?
The design uses refraction of the objective lens to form an image. This image is then observed with a second lens to allow the eye to see it. Except for the types of lenses used the same principle is used in optical telescopes and binoculars.
How do you prove using snell's law that rays passing through the optical center of a thin lens are not refracted?
Let: medium1= medium where ray enters the lens medium2= inside the lens medium3= medium where the ray is refracted outside the lens From medium 1 to medium 2 which is the lens Snell's law: n1sin(alfa1)=n2sin(alfa2) (1) And from medium 2 to 3 : n2sin(alfa2)=n3sin(alfa3) (2) Then, from (1) and (2): n1sin(alfa1)=n3sin(alfa3) But n3=n1 (same medium), =>n1sinalfa1=n1sinalfa3 => sin(alfa1)=sin(alfa3) (4) Therefore, alfa1=alfa2 knowing that they are less than 90o. As a conclusion the incoming ray and the refracted ray passing through the optical centre are parallel.
Is the geometric mean the same as the mean of two numbers?
No, the geometric mean is not the same as the mean of two numbers.
Is the contact lens grade the same as eyeglasses grade?
The 'grade' you are asking about is the dioptres (units of measurement of sight), which in turn is your optical or ophthalmological prescription. These would be the same regardless of the method of visual correction device, so yes, they are identical.
What happens when rays of light incident on a lens and parallel to the principal axis of the lens converge?
-- The distance from the center of the lens to the plane in which the rays converge is the 'focal length' of the lens. -- If the rays emanated from one point on an object, then rays from all the other points on the object do the same thing, and a real image is formed.
