Done By : Saeed Zaid / Osama Zaid / Abdulla Khamis Class : 12-03

Magnifier  A convex lens that is used to produce a magnified image of an object. The lens is usually mounted in a frame with a handle (see image).

Elbow telescope  A refracting telescope that uses a prism to bend the line of sight 90°.

Cassegrain Telescope  A two-mirror lens design used in astronomical telescopes, the primary being a parabola, the secondary a smaller hyperbola. The image formed is free of spherical aberration and color and is located behind the vertex of the primary.

Galilean telescope  A refracting telescope that yields an erect image by the use of a positive lens for its objective and a negative lens for its eyepiece.

Newtonian telescope  A telescope with a concave paraboloidal objective mirror and a small plane (diagonal) mirror that reflects rays from the primary mirror laterally outside the tube where the image is viewed with an eyepiece.

Microscope  An instrument consisting of essentially a tube 160mm long, with an objective lens at the distant end and an eyepiece at the near end. The objective forms a real image of the object in focal plane of the eyepiece where it is observed by the eye. The total magnification is equal to the linear magnification of the objective multiplied by the magnifying power of the eyepiece.

Microscope eyepiece  An eyepiece located at the near end of the microscope tube. It often is a simple Huygens eyepiece, but compensating and flat-field projection eyepieces are quite efficient. Negative eyepieces are sometimes used as projection relay lenses in photomicrography.

Binocular  A combination of two refractive telescopes which are held side by side. Light enters through the larger objective lens which is placed at front. The objective lens is used to gather light from the things what we are looking at. In between eyepiece and objective lens the triangular prisms are placed at right angle to fold the path of light and to help getting right end up image around so it doesn't look upside down.

Projector  The white light from the projector lamp is split into red, green, and blue components using two dichroic mirrors, special mirrors that only transmit light of a specified wavelength. Each red, green and blue beam then passes through a dedicated LCD panel made up of thousands of miniscule pixels. An electrical current turns the panel's pixels on or off to create the grayscale equivalent of that color channel. The three colors are then recombined in a prism and projected through the projector lens and onto the screen.

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