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What does 75 -300 mm mean in relation to camera lenses?
This is a Zoom lens with a focal length of between 75 and 300 mm.
The F-ratio is a ratio of what?
Applied to focusing lenses and mirrors, including telescopes, binoculars, and cameras, the focal ratio or 'F-number' is (the focal length of the lens or mirror) divided by (its aperture or diameter)
Jim bought a new pair of glasses The lenses had six sides The lenses were in the shape of a what?
The answer is C hexagon
If 2 lenses of a compound microscope are 5X and 30X what will be the total magnification?
you must multiply the two lenses getting a total of 150X
What do lenses do to the angle of incoming light?
It decreases it.
What is the relationship between curvature and focal length?
Curvature and focal length are inversely related. A shorter focal length corresponds to more curved surfaces, while a longer focal length results in flatter surfaces. This relationship is seen in various optical systems like lenses and mirrors.
What does 75 -300 mm mean in relation to camera lenses?
This is a Zoom lens with a focal length of between 75 and 300 mm.
What factor determines the focal length of a lens?
The curvature of the lens surfaces and the refractive index of the material the lens is made of determine the focal length of a lens. Thicker lenses with more curved surfaces have shorter focal lengths, while thinner lenses with less curved surfaces have longer focal lengths.
Formula for the radius of the curvature of the concave lens?
radius of curvature is double of focal length. therefore, the formula is: 1/f = (n-1)[ 1/R1 - 1/R2 + (n-1)d/nR1R2] here f= focal length n=refractive index R1=radius of curvature of first surface R2=radius of curvature of 2nd surface d=thickness of the lens using this, if you know rest all except one, then you can calculate that.
Why do convex lenses have shorter focal lengths than thin convex lenses?
Convex lenses have shorter focal lengths than thin convex lenses because they are thicker and have a higher refractive index, which causes light rays to converge more quickly. This results in a shorter focal length and a more powerful focusing ability.
Lenses are engineered to have specific focal lengths Besides the curvature of the two sides of a lens what determines the focal length?
Besides the curvature of the lens, the refractive index of the material the lens is made of determines the focal length. The refractive index affects how light rays bend as they pass through the lens, ultimately determining the focal point.
Do thick concave lenses have longer or shorter focal lengths than thin concave lenses?
Thick concave lenses have shorter focal lengths than thin concave lenses. This is due to the increased curvature of the lens surfaces in thick lenses, which causes light rays to converge more quickly to a focal point.
Do more curved lenses have smaller focal lengths?
No, the focal length of a lens depends on its shape and material properties rather than its curvature. A more curved lens may or may not have a smaller focal length depending on the specific design and purpose of the lens.
Describe the behavior of light that enables magnifying lenses and contact lenses to bend light rays.?
Magnifying lenses and contact lenses are curved to alter the path of light rays passing through them. The curvature of the lens causes incoming light rays to converge or diverge, depending on the focal length of the lens, which enables the lens to bend the light rays and focus them onto a single point, resulting in magnification or correction of vision.
If a telescope has an objective lens of 3 inches what is the focal length?
The focal length of a telescope is dependent on the design and specifications. It cannot be determined solely based on the objective lens size. The focal length needs to be provided by the manufacturer or measured using specific techniques.
Can a flat clear object magnify?
Yes, a flat clear object can magnify if it has a specific shape or curvature, such as a magnifying glass or a lenses. The curvature of the object helps to focus light rays, resulting in magnification.
Which lenses should be used to correct the defect of astigmatism?
Astigmatism can be corrected with toric lenses. Toric lenses have different powers in different meridians to correct the varying degrees of astigmatism present in the eye. These lenses are designed to address the irregular curvature of the cornea typical in astigmatism.
