Ray Diagram: Convex, Concave and Mirror

CONVEX

Ray 1 is parallel to the axis until it reaches the lens then refracts, passing through the focal point on the right.



Ray 2 passes through the center without bending

Ray 3 passes through focal point on the left until it reaches the lens then refracts, parallel to the axis.

CONCAVE

Ray 1 is parallel to the axis then refracts through the lens so that, when dotted back, it passes through the focal point.







Ray 2 passes through center without bending.

Ray 3 aims for the secondary focus, refracts through the lens and runs off parallel to the axis on the other side of the lens.

MIRROR

cite:http://dev.physicslab.org/Document.aspx?doctype=3&filename=GeometricOptics_ConvergingLenses.xml, http://dev.physicslab.org/Document.aspx?doctype=3&filename=GeometricOptics_DivergingLenses.xml, http://dev.physicslab.org/Document.aspx?doctype=2&filename=GeometricOptics_ManMirrorSolution.xml

Fiber Optics

Fiber optics is a technology using glass threads or plastic fibers to transmit data popular in local-area networks. Each glass thread can transmit messages modulated on light waves.

cite:http://www.webopedia.com/TERM/F/fiber_optics.html

Similarities Between the Eye and the Camera

First of all, both of them have an opening at the center for light to enter; aperture for the camera and a pupil for the eye. The camera has a diaphragm to control the size of the aperture(to control the amount of light entering camera/eye) while the eye has iris muscles to control the size of the pupil. Cornea is the main part of the eye(included are lens, aqeuos and vitreous humor) that functions to refract light as a glass biconvex does in the camera. Photosensitive chemicals on film(camera) and photoreceptors in the cornea(eye) are the objects of light action to form image. The last similarity is that they both absorb excessive light to prevent multiple images formation using a dark internal surface in the camera and a pigmented, dark choroid in the eye.

cite:http://library.thinkquest.org/28030/eyeevo.htm