Mell Can you make a telescope with a concave lens and convex lens?
A telescope can also be made with a concave mirror as its first element or objective, since a concave mirror acts like a convex lens as seen in Figure 3. Flat mirrors are often employed in optical instruments to make them more compact or to send light to cameras and other sensing devices.
How many convex lens are used in telescope?
Most refracting telescopes use two main lenses. The largest lens is called the objective lens, and the smaller lens used for viewing is called the eyepiece lens.
Which convex lens is used in telescope?
A Galilean telescope is defined as having one convex lens and one concave lens. The concave lens serves as the ocular lens, or the eyepiece, while the convex lens serves as the objective.
What happens when you put a concave and convex lens together?
Adding a second convex lens to this combination produces a simple telephoto lens, with the front convex and concave lens serving to magnify the image, while the rear convex lens condenses it.
How are convex lenses used in a telescope?
The final lens on a two convex lens telescope magnifies that image (see object between lens and F F ). This is similar to a microscope except, with a telescope, the principal focal length of the first convex lens must overlap the principal focal length of the final convex lens. The diagram below shows how this is explained using ray diagrams:
Can a concave lens be used as an objective lens?
A concave lens doesn’t bring light to a focus, so is of no use as the objective lens of a telescope. Concave lenses were used as eyepieces by Galileo.
What kind of telescope has a concave front surface?
A Maksutov-Cassegrain telescope has a concave front surface to the objective lens. This is, however, as part of a meniscus lens (the lens is part of a hollow sphere).
When does a ray strike a concave lens?
In this article, we will learn about image formation by concave and convex lenses. When a ray strikes concave or convex lenses obliquely at its pole, it continues to follow its path. When a ray, parallel to principal axis strikes concave or convex lenses, the reflected ray passes through a focus on the principle axis.