KEY CONCEPT FIGURE 18.32 Rays from an object point P are refracted by the lens and converge to a real image at point P'. Rays leave P (and Q and R) in every direction. For clarity, only a few are shown. Special rays All the rays leaving one point in the object plane (P) that reach the lens are refracted by it and converge to one point in the image plane (P"). Lens plane Object height h This is a Far focal point real image. Object R' Image height h' Near focal point Optical axis Object plane Image plane Cardboard Screen Lens
Applications Of Reflection Of Light
When a light ray (termed as the incident ray) hits a surface and bounces back (forms a reflected ray), the process of reflection of light has taken place.
Sign Convention for Mirrors
A mirror is made of glass that is coated with a metal amalgam on one side due to which the light ray incident on the surface undergoes reflection and not refraction.
An object and lens are positioned to form a well-focused image on a viewing screen. Then a piece of cardboard is lowered just in front of the lens to cover the top half of the lens. Using what you’ve learned from as shown, what happens to the image on the screen?
A. Nothing
B. The upper half of the image vanishes.
C. The lower half of the image vanishes.
D. The image becomes fuzzy and out of focus.
E. The image becomes dimmer but remains in focus.
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