• Hold the Hold the apparatus apparatus lightlylightly ；；• Prohibit contacting the glass surface Prohibit contacting the glass surface

with your handswith your hands ；；• After experiment, turn off power of light, After experiment, turn off power of light,

and settle your desk.and settle your desk.

A.A. Experiment intentionExperiment intention

1. Knowing the basic structure and test principle, and mastering the adjustment method of spectrometer.2. Learning the theory and method of testing light wavelength according to raster diffraction.

B. B. Spectrometer structureSpectrometer structure

Telescope

Parallel Light tube

Slot adjust

Ocular

Raster

Vernier plate

Scale plate

Power

Light

Turning axis

Reflector Telescope

Telescope axis

Parallel light tube

Parallel light tube axis

Three uprights

载物台

Reflector

Telescope Telescope adjustmentadjustment Screen

Field lens

Reflector450

Ocular

Screen

ScreenReflector

Light path demo

Reflector 1

Reflector2

1/2hh

Incidence

Raste

r 1

d

a b

dSin1 1

Y2,1 G

P

Y1,2 G

P

The middle

K=0

The first series

K= -1

The first series

K= +1

QuestionsQuestions

1.1. If raster is placed at another surface incidencIf raster is placed at another surface incidence direction, or raster is not placed in the centre direction, or raster is not placed in the central load plat format, the annex error will be inal load plat format, the annex error will be inducted or not?ducted or not?

2.2. How to test the raster constant using the expeHow to test the raster constant using the experiment systemriment system ？？