Your optics bench is guaranteed straight to within 0.25 mm over its full one meter length,and, under normal use,will retain its straightness.However the optics bench will bow slightly if heavily loaded.For example,a one-kg mass placed in the center of the bench will produce a deflection of approximately 0.07 mm. NOTE:Avoid scratching or otherwise abusing the surface of the magnetic pads on the top of the optics bench.If they get dirty,use only soapy water or rubbing alcohol for cleaning.Other solvents may dissolve the magnetic surfaces. The Incandescent Light Source The incandescent light source(see Figure 3)provides 1 5 candlepower of light with the frequency spectrum shown in Figure4.The built-in power supply of the light source is regulated,so there's minimal variation in the intensity of the light.This is essential for obtaining accurate data in experiments where a photometer is being used to measure light intensities. ·region fuse over the light a ON witch 10 hmmgmmm 1.000 10.000 100,000 filament knob Wavelength in nanometers Flgure 4:Frequency Spectrum for the Figure 3:Using the Incandescent Light Source NOTE:The distance from the front panel of the light source to the light bulb filament is approximately 22 mm. To turn on the light source,connect the power cord to a grounded receptacle of the appropriate line voltage (120 VAC,60 Hz,unless otherwise specified),and flip the switch on the rear panel to ON.If at any time the light fails to come on,chances are that the fuse is blown or the light bulb is burnt out.See the Maintenance section for replacement instructions. The Filament knob on the top of the light source adjusts the position of the light bulb filament transverse to the optical axis of the bench.The filament moves in the same direction as the knob is turned.Components can be mounted onto the magnetic pad on the front panel of the light source, over the light aperture.The crossed-arrow target,for example,is often mounted in this way as an object for lens experiments. CAUTION:When used continuously,the light source becomes hot to the touch.Since it requires no warm-up time,we recommend it be turned on only when setting up or actually performing an experiment.5 Your optics bench is guaranteed straight to within 0.25 mm over its full one meter length, and, under normal use, will retain its straightness. However the optics bench will bow slightly if heavily loaded. For example, a one-kg mass placed in the center of the bench will produce a deflection of approximately 0.07 mm. ★NOTE: Avoid scratching or otherwise abusing the surface of the magnetic pads on the top of the optics bench. If they get dirty, use only soapy water or rubbing alcohol for cleaning. Other solvents may dissolve the magnetic surfaces. The Incandescent Light Source The incandescent light source (see Figure 3) provides 1 5 candlepower of light with the frequency spectrum shown in Figure4. The built-in power supply of the light source is regulated, so there's minimal variation in the intensity of the light. This is essential for obtaining accurate data in experiments where a photometer is being used to measure light intensities. ★NOTE: The distance from the front panel of the light source to the light bulb filament is approximately 22 mm. To turn on the light source, connect the power cord to a grounded receptacle of the appropriate line voltage (120 VAC, 60 Hz, unless otherwise specified), and flip the switch on the rear panel to ON. If at any time the light fails to come on, chances are that the fuse is blown or the light bulb is burnt out. See the Maintenance section for replacement instructions. The Filament knob on the top of the light source adjusts the position of the light bulb filament transverse to the optical axis of the bench. The filament moves in the same direction as the knob is turned. Components can be mounted onto the magnetic pad on the front panel of the light source, over the light aperture. The crossed-arrow target, for example, is often mounted in this way as an object for lens experiments. ★CAUTION: When used continuously, the light source becomes hot to the touch. Since it requires no warm-up time, we recommend it be turned on only when setting up or actually performing an experiment