IPC LIGHT SPECTRUM TEST REVIEW

1. IPC LIGHT & SPECTRUM TEST REVIEW 25 MC @ 2 PTS = 50 10 Matching @ 2 PTS = 20 6 PROBLEMS @ 5 PTS = 30 100 5 PT BONUS: current material

2. VOCABULARY Transparent This allows light to pass through with little change to the image. Translucent This allows some light to pass through but distorts the image detail. Opaque This absorbs or reflects all light.

3. VOCABULARY Reflection This is what light does when it strikes a shiny object. Plane mirror Flat surface that reflects normal sized images that are virtual Concave Mirror Curved inward the reflects and converges light, reduces, magnifies and has normal size images that can be real or virtual Convex Mirror Curved outwards that reflects and diverges light, reduces size of image, and produces a virtual image

4. VOCABULARY Refraction The bending of light rays because a light ray crosses a boundary from one substance to another Concave Lens Thick on the edges and diverges light, reduces image and is used to correct nearsightedness Convex Lens Thick in the middle, converges light, magnifies image and used to correct farsightedness.

5. VOCABULARY Focal point The point at which light rays MEET after passing through a convex lens. Focal length The DISTANCE from the center of the lens to the focal point.

6. VOCABULARY Angle of incidence Angle made between the normal and incident ray of a reflection or refraction. Angle of reflection Angle made between the normal and reflected ray. * These two should be equal to each other!!

7. VOCABULARY Virtual image Upright or erect image (how we normally see) Real image Inverted or upside down image (how our eye makes an image but then our brains flip it.

8.  1. List the EM spectrum from lowest to highest frequency. 2. List a common use for each type of wave in the EM spectrum. Radio : radio & TV transmission Microwave : cell phones & cook food Infrared : heat lamps Visible : ROYGBIV Ultraviolet : sun rays (blocked by sunscreen) X-rays : see bones Gamma : radiation treatment

9.  3.What wave has the shortest wavelength? Gamma rays (highest frequency) What wave has the longest wavelength? Radio waves (lowest frequency)

10.  4. What are the three primary colors of light? Red, green & blue 5. What are the 3 complementary colors of light (AKA primary colors of pigment) & how are they made? Magenta : red & blue Cyan : green & blue Yellow : red & green

11.  6. What color do you get when you mix red, blue and green light together? WHITE 7. What are the three things that can happen when light strikes a surface? Reflect (shiny/opaque object), transmit & refract (transparent object), absorb (opaque object) 8. Why are we able to see objects? (2 reasons) ***light is reflected**** also light is absorbed

12.  9. Draw and label a diagram of reflection off a plane mirror. Tell what type and size of image will be formed. normal sized images that are virtual 10. Draw a diagram of a reflection off a convex mirror. Tell what type and size of image will be formed. reduces size of image, and produces a virtual image

13.  11. Draw a diagram of a reflection off a concave mirror. Tell what type and size of image will be formed. reduces, magnifies and has normal size images that can be real or virtual 12. What is the 1st law of reflection? The angle of incidence = the angle of reflection

14.  13. Draw a diagram of refraction through a concave lens. Tell what type and size of image will be formed. reduces image /NOT NECESSARY 14. Draw a diagram of refraction through a convex lens. Tell what type and size of image will be formed. Magnifies, REAL image (like lab)

15.  15. What part of the eye is responsible for detecting color? Cones 16. What part of the eye is responsible for detecting light intensity? rods

16.  17. What part of the eye is responsible for controlling the AMOUNT of light entering the eye? Iris 18. Why can we focus on objects that are near and objects that are far away? The lens changes thickness

17.  19. Which wave has a faster speed – sound or light? Light (anything on the electromagnetic spectrum)

18. REVIEW of REVIEW Water characteristics (polar) Solubility graphs Periodic table trends (reactive on outsides with Noble gases being least reactive) Acid/Base pH pH scale 1-14 1 = most acidic 7 = neutral 14= most basic Electrolytes

19. REVIEW of REVIEW Formulas from formula chart: Speed s = d/t current I = V/R electrical power P=IV Electrical energy/cost (convert W to KW) E= Pt (*KWH) E(charge) = Bill speed of wave v = f?