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unit 8:
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#tnpscphysicslight
#tnpscphysicsopticsintamil
#10STD-lens
#ConvexandConcaveLenses
#concaveandconvexlensintamil
#tnpscphysicsintamil#tnpscphysicsheat
#lightandsound
#10thstdPhysics
#oliyiyal
#tnpscphysicsopticsintamil
#tnpscoptics
#ஒளியியல்
#tnpscphysicsgroup2
#tnpscஇயற்பியல்
#tyndalleffect
#whyskyisblue
#tnpscphysicsimportanttopics
#ramaneffect
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