OPTICAL INSTRUMENT

Done By : Saeed Zaid / Osama Zaid / Abdulla KhamisClass : 12-03

Magnifier

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).

Telescopes

Elbow telescope

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

Telescopes

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.

Telescopes

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.

Telescopes

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.

Microscopes

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.

Microscopes

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

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

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.

Resorces

http://www.optics4kids.org/Home/Terms/Instruments.aspx

http://ratnaveera.hubpages.com/hub/BINOCULARS-MAKE-THE-BEST-AND-CHEAPEST-HOBBY-IN-OUR-LIFE

http://en.wikipedia.org/wiki/Magnifying_glass http://www.opticalres.com/gentsupp_f.html http://www.projectorpeople.com/lcd-projectors/ http://eng3060.pbworks.com/w/page/18918888

/how%20do%20projectors%20work

http://www.yesmag.ca/how_work/binoculars.html