Refracting
The convex lenses can be used in magnifying glasses. They are thicker in the center than in the edges. They are also used in the glasses of those affected with farsightedness. The shape of the lenses used for our eyes is also convex so as to allow it to fit snugly into the eye in shape.
Bias occurs when scientists' expectations change how the results of an experiment are viewed.
b
something that is viewed in 3-d
A coverslip goes on top of a slide to trap the matter being viewed.
Concave mirrors magnify what is viewed in them. That is similar to how convex lenses work (things work opposite with mirrors). So you get a closeup view of your face while you apply makeup.
Telescopes use lenses or mirrors to collect and focus light from distant objects. The lenses or mirrors help to magnify the light and form an image that can be viewed by the observer.
refracting
The Newtonian Telescope.
With a telescope yes.
the scientist viewed the stars with his brand new telescope.
The mirror in this case is a convex mirror, as virtual images are formed by convex mirrors.
According to scientists, the refracting telescope uses a convex lens which increases the size of an image. The most common use of this telescope is for viewing solar system planets such as Jupiter and Mars.
A reflecting telescope uses a curved mirror to concentrate the light from distant stars, and is a very useful technique. There are very clever techniques and technicians, which can produce a mirror perfect over all its area, to within part of the wavelength of light!! The alternative method of using a glass lens, suffers from various difficulties, such as distortion and loss of light. You do not ordinarily consider focus in an astronomical telescope, for all the stellar objects are essentially at infinity.
A concave lens diverges light rays that pass through it, causing them to spread out. This spreading out of light results in the image appearing smaller when it reaches the eye. This is why objects viewed through a concave lens appear smaller than when viewed with the naked eye.
there is something in the telescope that helps things appear larger
Concave D. Diverging