1. Hi tutor, I need to take a picture/s of yourself using/showing a use of concave/convex mirror. Then Write a short explanation about the picture you represent.

note: it is okay to blur your face in a picture.

2. Review this concept:

Ray Diagrams for Concave Lenses The ray diagrams for concave lenses inside and outside the focal point give similar results: an erect virtual image smaller than the object. The image is always formed inside the focal length of the lens. If you look at an object If you move the object through a concave lens, further out, the image it will look smaller will not move as and closer. much. Index Object Lens concepts f Object Image Image Object inside Object outside focal point focal length Ray diagrams for lenses Go Back HyperPhysics***** Light and Vision R Nave Ray Diagram for Two Lenses 1. The principal rays 1 and 2 are used to determine the location of the of the image for lens 1 alone. 2. Ray 3 through f, will approach lens 2 parallel to the axis and will project through focal point f2, forming one Index principal ray (4) for the ............. 2 Image final image. Lens - 2 --..... 5. f1 concepts 3. Back projecting from Object f1 .......al Image for the single lens image lens 1 alone through the center of lens 2 will define the second needed ray (5) since that ray will be undeflected. Ray diagrams for lenses HyperPhysics***** Light and Vision R Nave Go BackX Ray Diagrams for Lenses i hyperphysics.phy-astr.gsu.edu Ray Diagrams for Lenses The image formed by a single lens can be located and sized with three principal rays. Examples are given or converging and diverging lenses and for the cases where the object is inside and outside the principal focal length. Convex Concave Two Lens Object outside focal point Object outside focal point Index Lens Mirror ray concepts Object inside focal point Object inside focal point tracing The "three principal rays" which are used for visualizing the image location and size are: 1. A ray from the top of the object proceeding parallel to the centerline perpendicular to the lens. Beyond the lens, it will pass through the principal focal point. For a negative lens, it will proceed from the lens as if it emanated from the focal point on the near side of the lens. 2. A ray through the center of the lens, which will be undeflected. (Actually, it will be jogged downward on the near side of the lens and back up on the exit side of the lens, but the resulting slight offset is neglected for thin lenses.) 3. A ray through the principal focal point on the near side of the lens. It will proceed parallel to the centerline upon exit from the lens. The third ray is not really needed, since the first two locate the image. Reversibility of object and image points: conjugate points HyperPhysics** *** Light and Vision R Nave Go Back Ray Diagrams for Convex Lenses Object For an object outside the focal Image point, a real inverted image will be formed. Index Lens concepts Image For an object inside the focal point, a f Object virtual erect image will be formed. Ray diagrams for lenses HyperPhysics* **** Light and Vision Go Back R Nave