The first part of the experiment is divided into two parts. Part A is the Determination of Index of Refraction of Glass when light goes from Glass into Air & Part B is the Determination of Index of Refraction of Glass when light goes from Air into Glass. The tale shows the results otained in determining the index of refraction of glass. The results show that even though line G! is not almost the same as light ends from glass to air and as light ends from air to glass. It still shows that the angle of incidence at these two parts is almost e"ual to each other. !owever# line $% has also a difference etween part A and part B. Based from the results I can deduce that the angle of refraction when light ends from glass to air is larger than the other in part B. 'hen I was solving for the index of refraction of glass# I got (.)*))and (.)(*+ respectivel,. This shows that the index of refraction of glass is fixed. 'hen it is compared to the accepted value# it is on the acceptale range. I got +.-++ and -./)++ percent errors.
The second part of the experiment or the Part 0 is the Determination of the 0ritical Angle 1
θc
2 for Glass. The tale shows the results in determining the
critical angle for glass. The critical angle is different when different mediums are used. The critical angle of glass is fixed to e *(.3(-+4. I otained a percent error of 5.6()7# with errors 8ust li9e what we encountered in the previous parts. Based from the drawing in the instructions# it is shown that as the length of the line :; increases# the critical angle also increases. 'ith the percentage error not exceeding at acceptale range we 9now that we had conducted the experiment properl,.
0onclusion At the end of this experiment# I was ale to achieve the o8ectives of this experiment. The o8ectives were were to stud, the refraction of of light# compare the angle angle of incidence in the first medium to the angle of refraction in the second medium and to determine the index of refraction of glass experimentall, , appl,ing =nell>s %aw. ?=nell>s %aw states that the ratio of the sine of the angle of incidence to the sine of the angle of refraction is constant# which is called the relative index of refraction of the second medium to the first medium.@ At the end of the experiment# I found out that light# when refracted# ends due to its velocit, decreases at medium of higher densit, and also# the refraction of light results to apparent change in position of the o8ect seen , e,e. It I t is also concluded that the ratio of the index of refraction of medium from where light travels to the second medium is e"ual to the ratio of sine of angle of refraction and the sine of angle of incidence. The results show that angle of incidence is greater when light waves travels from a less dense medium into a denser medium. The value of the index of refraction is alwa,s greater than (. It will never e less than ( ecause the speed of light in vacuum is fastest compared to when passing to other media. Another Another conclusion is that when light ends from a denser medium to a less dense medium# the angle of refraction is large as compared when light ends from a less dense medium into a denser medium. !owever# the angle of incidence is the same even at different medium ecause this is the fixed angle that the light will enter the medium. nowing the theories ehind this experiment can help ,ou a lot and minimie the percent error. %earning aout index of refraction was fun ut 9ind of hard. Index of refraction has man, real life applications. It can e applied for identif,ing a particular sustance# confirm its purit,# or measure its concentration. Generall, it is used to measure the concentration of a solute in an a"ueous solution. $or a solution of sugar# the refractive index can e used to determine the sugar content. It can e used also in determination of drug concentration in pharmaceutical industr,. industr,.
