Focal Length of Lenses
PHY 201 & 231
Lab PDF 1Lab PDF 2
Based on Loyd #41. Students use a precision optics bench and several lenses alone and in combination to form real and virtual images. Converging lenses have a positive focal length and form both real and virtual images, while diverging lenses have a negative focal length and form only virtual images. Students form a real image of a distant object with a converging lens and determine the focal length of that lens. The students will also measure the focal length of a diverging lens by using it in combination with a converging lens to form a real image.
Equipment
| Name | Location | Quantity |
| Light Sources | JE-105A-D29 | 1 per table |
| Holder, Lens | JE-105A-D34,D12 | 2 per table |
| Object Screens | JE-105A-D23 | 1 per table |
| Clamp, Optics Bench | JE-105A-D30, D31 | 5 per table |
| Optics Bench End Supports | JE-105A-D31 | 2 per table |
| Rods, Clip | JE-105A-D24 | 1 per table |
| Image Screens | JE-105A-D26, D35 | 1 per table |
| Optics Bench Rod | JE-105A (Next to File Cabinet) | 1 per table |
| Ruler, Transparent, Flexible | JE-105A-D90 | 2 per table |
| Tape, Masking | JE-105A-D63 | 1 per table |
| Teaching Lenses, Black (Focal Length: -15cm) | JE-105A-D32 | 1 per room |
| Teaching Lenses, Green (Focal Length: 12.5cm) | JE-105A-D32 | 1 per room |
| Teaching Lenses, Red (Focal Length: 24.5cm) | JE-105A-D32 | 1 per room |
| Protractor | JE-105A-D90 | 2 per table |
Notes
Object mesh mounts to zero on scale, light bulb mounts off scale beyond zero mark.
1.) Put out ONLY red, green and black lenses.
2.) Leave one extra light fixture in the back of the room.
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Item modified on 2015-07-15 15:28:56 by damicoa6.