oot of the first pin will after refraction into the air passthrough the foot of the second pin. Remove the glass. Let ABCD, fig. 40, represent the trace of the glass on thepaper, Q the foot of thevertical line, R the foot ofthe first pin and P that ofthe second. Then QR is aray in the glass which… … With R as centre and Figt 40. RQ as radius1 describe a circle cutting RP in P. Draw PM perpendicular to thenormal MN. Measure PM and QN and take their ratio. This, if thelaw of refraction holds, measures the refractive index andshould be the same for all angles of incidence, i.e. for allpositions…
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