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The tendency to converge the rays decides the power factor. So shorter the focal length converging is tremendous. Hence power is reciprocal of focal length
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∙ 11y ago
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Why a small focal length convex lens is used in simple microscope?
because manifying power has inerse relation with that of focal length
How is the focal length of a spherical mirror affected when the wavelength of light used is increased?
The focal length does not depend upon the wavelength or the frequency so it remains unaffected.
What is the medical application of the focal length?
By using the science of focal length, doctors are able to perform ultrasound focal beam surgery. This surgery is used in places such as the brain where tissue and cell damage must be minimal.
The magnification of a telescope is changed by changing the?
The magnification of a telescope is the ratio of the effective focal length of the objective to the focal length of the eyepiece. For example, a small telescope's objective may have a focal length of 800mm. When an eyepiece with a focal length of 25mm is used, the magnification is 800/25 = 32. The term "effective focal length" refers to the focal length of the objective as affected by any "focal extender". Many telescopes are designed to have a short total size, but high power, by "folding" the optical path. A mirror-type objective with a focal length of perhaps 800mm is coupled with a smaller curved mirror that intercepts the last 200mm and extends it to 800mm, a 4x extension, so that the effective focal length of that objective is 3200mm. Use that with a 25mm eyepiece and the magnification is 3200/25 = 128. By the way, if a telescope is smaller than you are, it is seldom much use to view using a magnification greater than 50 to 100. Most objects are best viewed at relatively low powers such as 30 or so.
Which is better greater focal length or smaller?
It depends on what the lens is being used for.
The magnification of a telescope is changed by changing the what?
The magnification of a telescope is the ratio of the effective focal length of the objective to the focal length of the eyepiece. For example, a small telescope's objective may have a focal length of 800mm. When an eyepiece with a focal length of 25mm is used, the magnification is 800/25 = 32. The term "effective focal length" refers to the focal length of the objective as affected by any "focal extender". Many telescopes are designed to have a short total size, but high power, by "folding" the optical path. A mirror-type objective with a focal length of perhaps 800mm is coupled with a smaller curved mirror that intercepts the last 200mm and extends it to 800mm, a 4x extension, so that the effective focal length of that objective is 3200mm. Use that with a 25mm eyepiece and the magnification is 3200/25 = 128. By the way, if a telescope is smaller than you are, it is seldom much use to view using a magnification greater than 50 to 100. Most objects are best viewed at relatively low powers such as 30 or so.
Does focal length of convex lens depend on colour of light used?
yes, of course
Which lens of suitable focal length is used for correcting a hypermetropic eye?
convex lens
If a telescope with an objective lens of ten feet focal length is used with an eye piece of one quarter inch focal length what would the resulting magnification be?
The magnification (MA) equals the focal length of the objective lens (fo) divided by the focal length of the eyepiece (fe), which is this: MA = fo / fe = 10 feet / .25 inches = 120 inches / .25 inches = 480 A link to the Wikipedia article on magnification is included.
Why concave lens of large focal length is used to find refractive index of liquid?
physics
How can a concave lens be used?
In glasses to further the focal length so it is able to be focused at the retina.
Why do people use the lights from a window instead of using the room lights when measuring the focal length of a convex lens?
Light coming from a distance will be made up of relatively parallel rays of light. Making the approximation to the focal length (by means of a ray diagram) more accurate than if you used a light source that is at a distance comparable to that of the lens' focal length.
