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Refraction & Lenses

PHY 100 & 103


Students use 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 only form virtual images. Students form a real image of a distant object with a converging lense and determine the focal length of that lens. The students will also measure the focal length of a diverging lens by using it combination with a converging lens to form a real image.


Name Location Quantity
Clamp, Optics Bench JE-105A-D30, D31 5 per table
Holder, Lens JE-105A-D34 2 per table
Image Screens JE-105A-D26, D35 1 per table
Light Sources JE-105A-D29 1 per table
Meter Stick - 2.00m JE-105A-(105 Door-L) 1 per table
Object Screens JE-105A-D23 1 per table
Optics Bench End Supports JE-105A-D31 2 per table
Optics Bench Rod JE-105A (Next to File Cabinet) 1 per table
Protractor JE-105A-D90 2 per table
Rods, Clip JE-105A-D24 1 per table
Ruler, Transparent, Flexible JE-105A-D90 2 per table
Tape, Masking JE-105A-D63 1 per table
Teaching Lenses, Green (Focal Length: 12.5cm) JE-105A-D32 1 per room
Lenses (Misc) JE-105A-D19, 20 1 per room


Object mesh mounts to zero on scale, light bulb mounts off scale beyond zero mark. 2.00 m sticks prefered, 1.75 m or 1.00 m sticks may be substituted if 2.00 m sticks are unavailable. Set up the rods so that the light sources are closest to the wall.

Use the lenses with focal length 12.5 cm (B, green) and with focal length 17 cm (small, in styrofoam). Along with the initial apparatus set-up, supply a sufficient number of the appropriate paper procedure handouts for all of the lab sections that will use the set-up over the course of the week. Print the PDF, duplicate to double-sided pages, staple, and leave pile on instructor's table prior to first use of set-up.

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Item modified on 2017-02-23 15:19:59 by preisingc1.