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Why does a lens with a 2-cm diameter have 4 times the light-gathering power of a 1-cm lens?
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How do you calculate microscope power?
the objective lens has the power of that lens inscribed on it
What happens when you increase the diameter of a telescope?
Specifically if you increase the diameter of the main lens, or of the main mirror (depending on the type of the telescope), you'll be able to observe dimmer objects (stars, planets, etc.). Also, the telescope's resolving power (angular resolution) improves with a bigger mirror/lens. For example, with a bigger mirror/lens you'll be able to distinguish two stars that are closer together as separate objects.
What is 20 x 70 mm telescope?
20 refers to the amplification, 70 mm to the diameter of the main lens or mirror. Note: This diameter is by far the most important piece of information.
What is the power of the objective lens multiplied by the power of the eyepiece?
The eyepiece is usually 10x, so multiply the objective by 10 to get true magnification
If a microscope lens has a magnification of 15 and another has a magnification of 40 what is the total magnification of the microscope?
it would be 15 times 40 which is 600 times magnification
Why does a lens with with 2 cm diameter have 4 times the light gathering power of a 1 cm lens?
Because the 2cm lens has 4 times the area of a 1cm lens. (area = Pi*r2)
How do you calculate field diameter?
Field diameter of lens B equals field diameter of lens A times total magnification of lens A divided by total magnification of lens B
How would you estimate the size of object viewed under high power objective lens 40 times if you were given the size of the field diameter when using low power objective lens 4 times?
the naswe is 400
When looking for a scope what does the 6 mean in 6-24x40mm?
This is a variable power scope- from 6 power to 24 power. The front lens (objective lens) is 40mm in diameter.
What is the meaning of 4x40 in a rifle scope?
It magnifies 4 times, and the objective (front lens) is 40 mm in diameter. A 3x9-40 would be a 3 to 9 power variable magnification scope, with a 40mm objective lens.
Are light-gathering power and resolving power determined by the primary mirror of a telescope?
Yes, both have to do with the diameter of the objective mirror/lens
What is the magnification of a high power objective?
The oil immersion lens or objective has power 90X-100X and an eyepiece lens generally in light microscope comes with 10X so total magnification of oil immersion lens is 100X10 = 1,000
What is a fast lens?
A fast lens will take a parallel beam of light and focus it in a relatively short distance. For example a 1 centimetre diameter lens that focusses the light to a spot 2 centimeters after the lens is quite fast. It has a short focal length, only two times longer than the diameter of the lens. We say it is an f/2 lens. Very few fast lenses are faster than f/1. It is dificult to design fast lenses that have good image blurring, high light transmission and low image distortion. Good ones are expensive. A long focal length lens for example that focusses a parallel beam to a spot at a distance 20 times its diameter after the lens would becalled a slow lens.
Whats the meaning of 3x9x40 in a rifle scope?
This is a variable power scope- from 3 to 9 power (first two numbers). The front lens is 40 mm in diameter.
How many times will a microscope lens with a power of 40X magnify an object?
40X
How many times would a cell be magnified if you viewed it through the low power lens?
10 times
How much more light gathering power would a telescope with a 50 cm objective lens have than a telescope with a 25cm objective lens?
Provided that the parabolic shapes of the surfaces of both reflectors are similarly accurate,the "gains" are proportional to the areas, which also means proportional to the square ofthe diameters.(300m/50m)2 = (6)2 = 36 times moreor the larger reflector has 10log(36) = 15.6 dBmore gain, at any specific wavelength.
