P3 V2

PEICAI SECONDARYSCHOOLSECONDARYFOUREXPRESSPRELIMINARYEXAMINATION2021 CANDIDATENAME CLASS REGISTERNUMBER PHYSICS 6091/03 Paper3Practical 17August 20211hour 50minutesCandidatesanswerontheQuestionBooklet. AdditionalMaterials: AslistedintheConfidentialInstructions READTHESEINSTRUCTIONSFIRST Writeyourname,classandregisternumberonalltheworkyouhandin.Writeindarkblueorblackpen.YoumayuseanHBpencilforanydiagramsorgraphs.Donotusestaples,paperclips,glueorcorrectionfluid. Answer allquestions.AllofyouranswersshouldbewritteninthisQuestionPaper:scrappapermust notbeused.GraphpaperisprovidedinthisQuestionPaper.Additionalsheetsofgraphpapershouldbeusedonlyifitisnecessarytodoso. Youwillbeallowedtoworkwiththeapparatusforamaximumof55minutesforeachsection.Youareexpectedtorecordallyourobservationsassoonastheyaremade.Anaccountofthemethodofcarryingouttheexperimentsisnotrequired. ForExaminer’sUse 1 2 3 Total Theuseofanapprovedscientificcalculatorisexpected,whereappropriate. Attheendoftheexamination,fastenallyourworksecurelytogether.Thenumberofmarksisgiveninbrackets[ ]attheendofeachquestionorpartquestion. Perseverance Respect Responsibility Integrity Discipline Empathy

2 Thisdocumentconsistsof 12printedpages. Setter:Mr.AndyYeo1 In this experiment, you willinvestigate the refraction oflight passing through aglassblock. Youareprovidedwith ● 4opticalpins,● asoftboard,● aprotractor,● aglassblock,● ahalfmetrerule,● apieceofA4paper. (a) (i) Placetheglassblock,withitslargerfacedown,atthecentreofthepieceofA4papersupplied.Drawtheoutlineoftheglassblock.LabelitasABCD,asshowninFig.1.1.

3 Fig. 1.1 (ii) Removetheblockanddrawanormal NLatthecentreofsideAB.Labelthepoint EwherethenormalcrossesAB.Labelthepoint MwherethenormalcrossesCD. (iii)DrawalineFEatanangle, i=30ºwiththenormal,asshowninFig.1.1. (iv)Replace the glassblockontheA4paper.PlacetwopinsP1 andP2 on the line FE.Label thepositionsP1 andP2 . (v) ObservetheimagesofP1 andP2 throughsideCD of the block sothat theimagesof P1 andP2 appeartobeinastraightline. (vi)PlacetwofurtherpinsP3 and P4 betweenyoureyeandtheblocksothat P3 andP4 arealigned with theimages of P1 andP2 so that all four pinsappear to be in astraightline.LabelthepositionsP3 andP4 .(vii) Remove the glassblock. (viii) Draw a line joiningthe positions of P3 and P4. ContinuethelineuntilitmeetsthesideCDandlabelthispoint J. ContinuethesamelineuntilitmeetsnormalNL and label this point K.[1]

4(b) (i) MeasureandrecordtheangleαbetweenthelinejoiningthepositionsofP3 andP4 andthelineKL. α=………………….[1] (ii) MeasureandrecordthelengthxbetweenpointsMandK,leavingyouranswerincm. x=………………….[1] (c) A student suggests thatthe angle α shouldalwaysbeequaltotheangleofincidencei. Statewhetheryourresultssupport thissuggestion. Justifyyour answer byreference to thereadings. ………………………… ………………………… ………………………… ………………………… ……………..... ………………………… ………………………… ………………………… ………………………… ………….....[1]

5Insert theA4paper of yourraydiagramintothisQuestionPaper betweenpages2and3. (d) Plan It is known that therelationshipbetween iandris sini =nsinr, where nistherefractiveindexoftheglassblockandisaconstant iistheangleofincidenceofanincidentray ristheangleofrefractionofarefractedraywithintheglassblock UsingthesameapparatusasinFig. 1.1, plananexperiment to

6investigate thisrelationship. Yourplanshouldinclude ● adetaileddescriptionofhowyouwouldperformtheexperiment, ● asuitabletableinwhichto display yourmeasurements andcalculated values (youdo not need to enteranydataintothetable), ● a statement of thegraph that youwould plot to testtherelationship, ● astatementofhowtherefractiveindexcan bedeterminedfromthegraph. …………………………………… …………………………………… …………………………………… ………… …………………………………… …………………………………… …………………………………… ………… …………………………………… ……………………………………

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