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Vocab

Vocab. Incidence. Incidence Angle. mirror. The intersection of light with a surface. Intersection. Whenever light strikes a surface, the angle of incidence is equal to the angle of reflection. Vocab. Reflection. Reflected Angle. mirror.

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Vocab

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  1. Vocab Incidence Incidence Angle mirror The intersection of light with a surface Intersection Whenever light strikes a surface, the angle of incidence is equal to the angle of reflection.

  2. Vocab Reflection Reflected Angle mirror An amount of light, heat or sound that is thrown back Throwing back, bouncing off, Both Edward Cullen and Dracula cannot see their reflections in the mirror. How do they style their hair?

  3. Vocab normal Normal mirror A perpendicular (90°) intersection of a line or surface Perpendicular, right angle, 90° The line normal to the mirror is 90° from the mirror. The normal is between the incident and reflected rays.

  4. Vocab Parallel lines Parallel Parallel lines always have the same distance between them • Parallel of latitude • Never crossing • 并行 (?) Parallel lines will never cross

  5. Vocab Infinite 无限 ∞ Limitless or endless. Impossible to measure or calculate Black Holes! Larger than the largest number The mass inside a black hole is infinitely large. The number closest to 0 that is not 0 is infinitely small

  6. Vocab Image • Light rays • Not always behind a mirror or lens An optical appearance produced by light. Interesting fact: the image is not always BEHIND the mirror!

  7. Vocab Object The physical object that produces an image • Examples: ME when I look in the mirror! When Bella looks into the mirror she is the object. Her reflection is the image.

  8. Vocab Converge Come together from different directions to eventually meet • Come together • Cross • Eventually meet The students will converge in the cafeteria

  9. Vocab Diverge • Separate • Grow apart • Turn away Separate and go in different directions Monkeys and Humans diverged from a common ancestor

  10. Vocab Center of Curvature • Center of sphere Radius of the sphere the mirror was made from The center of curvature of a 10 meter sphere is 5 meters

  11. Vocab Focal length Focal Point • Where rays cross • “ “ come together • “ “ intersect Point at which rays converge (come together) f Every ray crosses the focal point

  12. Vocab Real Image Occur when light rays from an object reflect from a mirror and converge • Image in front of mirror • Only created by concave mirrors Movie theatre projectors create real images on the big screen.

  13. Vocab Virtual Image image object 2.0 m 2.0 m Occur when light rays from an object reflect off a mirror and diverge • Virtual images are behind the mirror Virtual images cannot be projected. My reflection in a plane mirror is a virtual image.

  14. Vocab + - Convex f object A surface that curves like theoutside (exterior) of a sphere • Outside of a sphere • Convex mirrors have negative focal points • - f and - C Convex mirrors only produce virtual images. The image is always behind the mirror.

  15. Vocab + - Concave f object A surface that curves inwards like theinside of a sphere • Cave • Inside of a sphere • + f and + C If it rains, you could stand under a concave mirror to keep dry. If you stood between the mirror and focal point your image would be virtual.

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