Which converging lens has the greatest power?
The convex lens of smaller focal length (= 20 cm) has greater power since focal length is reciprocal of power.
Has more focal length then its power will be?
Answer. Answer: Thick lens will have shorter and consequently thin lens will have greater focal length. Because, For a thick lens, the optical path length of the light is more, than for a thin lens, thus, the bending of light will be more in case of a thicker lens.
What happens if we increase the focal length?
The longer the focal length, the narrower the angle of view and the higher the magnification. The shorter the focal length, the wider the angle of view and the lower the magnification.
How does distance affect focal length?
For a fixed focal length and aperture size, increasing the object distance will increase the depth of field. For a fixed object distance and aperture size, increasing the focal length will decrease the depth of field.
Why does distance affect depth of field?
The main element, other than the aperture setting, that affect depth of field is distance. More specifically, the distance from the camera to the subject. As you move closer to your subject, the area of the image that is in focus gets smaller.
Is the focal length of objective lens is increased then?
If the focal length of the objective lens is increased, then the magnifying power of, microscope will increase but that of telescope will decrease. microscope and telescope both will decrease. microscope will decrease but that of telescope will increase.
What happens if the magnification of the objective lens is increased?
Going to high power on a microscope decreases the area of the field of view. The field of view is inversely proportional to the magnification of the objective lens. The specimen appears larger with a higher magnification because a smaller area of the object is spread out to cover the field of view of your eye.
How does the magnifying power and resolving power depend on the focal length of the objective?
The magnifying power of a telescope or a microscope depends upon the focal lengths of the lenses used. By a proper choice of the lenses, it is possible to increase the size of the image, i.e. the image subtends a large angle at the eye.
What would be the effect on the length of telescope if the focal length of the objective is increased?
So, clearly increasing the focal length of objective increases the magnifying power of the telescope. Increasing the focal length of the eye-piece decrease the magnifying power of telescope.
Which lens are used in telescope?
The basic refracting telescope has two lenses. The first lens is called the objective lens. This lens is a convex lens that bends the incoming light rays to a focal point within the telescope. The second lens is called the eyepiece.
Why is the size of the primary light gathering source important?
The size of the primary lens (in a refracting telescope) or primary mirror (reflecting telescope) determines its Light-Gathering Power (LGP). Higher magnification can cause a small, bright, point light to blow up into a dimmer disk, sometimes useful for noting contrasts in surface detail of such objects in planets.
Is buying a telescope worth it?
Most telescopes that cost less than $300 aren’t really worth it. We suggest getting good binoculars instead. Stay away from any telescope advertised for its magnifying power. For a child, look for a tabletop telescope that’s portable, easy to push around the sky, and virtually indestructible.
How big of a telescope do I need to see Pluto?
Although it is not much to look at, amateur astronomers can claim bragging rights for having seen Pluto with their own telescopes. Here’s how to do it: First, you need a fairly large telescope, at least 10 inches aperture, because Pluto is currently at magnitude 14.0, very dim in the sky.