malanee1134's version from 2016-02-08 07:21


Question Answer
Purpose To learn about telescopes
Simple telescopes involve......two convex lenses and gives an inverted image
Eyepiece lensthe lens nearest the observer's eye
Objective lensthe second lens. I tproduces a smal, real image of an object being viewed
Inverter lensthe third lens; can be introduced between the objective and the eyepiece in such a way as to produce an upright image for the observer
Astronomical telescopeThe image formed by the eyepiece is a virtual image of the real image produced by the objective. The observer will see an inverted image with this type of telescope.
Inverter lens transforms astronomical telescope into...Terrestrial telescope
Opera Glassinvolves convex lens as the objective and a concave lens as the eyepiece. Erect, magnified and virtual image to the eye. Field of view is quite limited
Focal point the location of the focus of the parallel light rays reflecting from a concave mirror (converging mirror) or passing through a convex lens (converging lens). It is also the location from which light appears to originate for a conex mirror (diverging mirror) that is reflecting parallel light rays or a concave lens (diverging lens) that is diverging parallel light rays.
Real imagethe image that can be viewed by the reflection from a screen placed at the image's location. The light rays forming the image actually pass through the physical location of the image.
Virtual imagesthe image cannot be formed on a screen. The light rays forming the image only appear to pass through the physical location of the image.
Concave lensa lens that DIVERGES light. Sometimes called a DIVERGING or NEGATIVE lens
Convex lensa lens that CONVERGES light. Sometimes called a CONVERGING or POSITIVE lens