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Reflection of Light

Animations courtesy of Dr. Dan Russell, Kettering University. Reflection of Light. Reflection: the turning back of a wave after meeting the boundary of a medium. Types of Behaviors:. Scattered reflection. Regular Reflection. transmitted. absorbed.

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Reflection of Light

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  1. Animations courtesy of Dr. Dan Russell, Kettering University Reflection of Light Reflection: the turning back of a wave after meeting the boundary of a medium Types of Behaviors: Scattered reflection Regular Reflection transmitted absorbed

  2. Mirror: an object that produces regular reflection at a high percentage of reflectance. Types of Mirrors A) Plane:Reflective surface lies in a plane B) Convex:Outside curve of the mirror is reflective C) Concave:Inside curve of the mirror is reflective Types of Images Real imageformed by light rays that actually converge through the image point.

  3. **Real images can only be formed by concave mirrors! Virtual imageis formed behind the mirror by reflected light rays that diverge, but appear to meet behind the mirror. **Virtual images are formed by plane, convex and concave mirrors! Plane Mirror Image always form a virtual image that appears the same size as the object, and just as far behind the mirror as the object is in front.

  4. Plane Mirror Image: hi = ho and Always virtual and: di = do

  5. What is unusual about this picture?

  6. The picture is upside down!

  7. Convex Mirror Image: Always Virtual and… But in proportionto each other: hi < hoand di < do hi = di ho do

  8. Concave Mirror Image: As the object approaches the mirror: A smaller real image is formed, then Again: A same size real image, then hi = di ho do No image at all, then Virtural image (hi > ho)

  9. Curved Mirror Terminology Center of Curvature C focal length (f) vertex principal axis F Principal Focus r = 2f radius of curvature (r)

  10. do Concave Mirror Image Formation  F di 1 = 1 + 1 f do di hi = di ho do

  11. do Convex Mirror Image Formation F Virtual distances cannot actually be measured! di Virtual distances are negative! • f is always negative for a convex mirror • di is always negative for a virtual image

  12. A man places an object 5.0 m in front of a plane mirror and plans to photograph the image of the object in the mirror. How far away from the lens should the camera be focused to produce the clearest possible image? A face that is 28.0 cm long is moved in front of a concave make-up mirror. If the focal length of the mirror is 20.0 cm, and the face is 15.0 cm from the mirror, how tall will the image be? A convex shoplifting mirror makes an image of a 1.85 m man appear to be only 45.0 cm tall. What is the focal length of the mirror?

  13. A candle that is 12.0 cm tall is placed in front of a concave mirror so that the image of the object is projected onto a screen. The image is measured to be 12.0 cm tall. What is the focal length of the mirror? A man whose eyes are 1.62 m above the floor stands 2.10 m in front of a plane mirror whose bottom edge is 43.0 cm above the floor. How much closer to the mirror must the man move in order to see his feet in the mirror?

  14. A student uses a concave mirror of focal length 7.60 cm located at the 80.00 cm mark on the optical bench. His object is located at the 68.00 cm mark. At what mark should he place his screen in order to see the real image produced? An object that is 2.00 cm tall is placed in front of a concave mirror and produces a virtual image that appears 5.45 cm tall. If the image is placed 7.00 cm in front of mirror, what must be the focal length of that mirror?

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