Optics Lab Essay

3049 words - 13 pages


* Optics bench
* Optics kit, including a lens/mirror mount
* Convex lens of known focal length
* Concave mirror of known focal length
* Light source/candle
* Screen
* Meter stick/metric ruler
* Two polarized films
* Prism
* Laser pointer
* Protractor
* Graph paper
* Electromagnetic spectrum chart

Materials for Exploring Further:

* Plane mirror
* Ripple tank, with sheet of plastic or glass that fits on part of the bottom of the tank, and objects that can be used as boundaries to obstruct the pathway of waves
* Wave-motion rope
* ...view middle of the document...

Using the lens equation and the given focal length, calculate the distance from the lens to the image (di) and the height of the image (hi). Record your calculations in the "Calculated" section of data table 1.

5. Turn on the light source, keeping it 2ƒ from the lens, and adjust the screen until a clear, real image is formed on the screen. Measure the experimentally determined di and hi, and write your observations in the "Experimental" section of data table 1.

6. Place the light source at a distance of somewhere between ƒ and 2ƒ from the lens. Record the distance between the lens and the light source (do) in the data table. Using the lens equation and the given focal length, calculate the distance from the lens to the image (di) and the height of the image (hi). Record your calculations in the "Calculated" section of data table 1.

7. Keeping the light source and lens in the same position, turn on the light source and adjust the screen until a clear, real image is formed on the screen. Measure the experimentally determined di and hi, and write your observations in the "Experimental" section of data table 1.

Data Table 1

ho = 1.5 cmƒ = 25 cm | Calculatedresults | Calculatedresults | Experimentalresults | Experimentalresults |
  | di | hi | di | hi |
Greater than 2ƒdo = 54 cm |  46.6 cm | 1.3 cm  | 46.4 cm | 1.3 cm |
2ƒdo = 50 cm |  50 cm |  1.5 cm | 49.5 cm | 1.4 cm |
Between ƒand 2ƒdo = 42 cm | 61.8 cm  | 2.2 cm  | 61.5 cm | 2.1 cm |

Part 2: Image from a Mirror

8. Repeat steps 1 - 7, this time using the concave mirror. Be sure to angle the mirror to project the image onto the screen, as shown in figure 2. Record your calculations and measurements in data table 2.

Figure 2

Data Table 2

ho = 1.5 cmƒ = 25 cm | Calculatedresults | Calculatedresults | Experimentalresults | Experimentalresults |
  | di | hi | di | hi |
Greater than 2ƒdo = 60 cm | 42.9 cm  | 1.2 cm  | 43.1 cm | 1.2 cm |
2ƒdo = 50 cm | 50 cm  |  1.5 cm | 48.5 cm | 1.5 cm |
Between ƒand 2ƒdo = 46 cm | 54.8 cm  | 1.8 cm  | 54.5 cm | 1.8 cm |

Part 3: Observing Polarization and Refraction

9. Place a polarized film over the light source. Place another polarized film on top of the first. Slowly turn the second film while keeping the first film stationary. Notice what happens to the brightness of the light.

10. Remove the polarized films. Place a prism over the light source. Turn the prism until you can see a rainbow.

11. Direct a laser pointer toward the prism at an angle, as shown in figure 3. Trace the shape of the prism on a piece of paper.

12. Trace the path of the laser through the prism.

13. Remove the prism and use a protractor to measure the angle of incidence and the angle of refraction. The angle measurements are recorded for you here:

Angle of incidence: 45°

Angle of refraction: 30°

Figure 3


1. What happens to the height of the image (hi) formed by a convex lens as the object moves...

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