Question

" med 2 M 200 air wsto water water mulia WWL33 Gove 1 Adwer several feet underwater Livects two Slashlight bean towerd the surface. Been Awal angle of you with respect to the normal to the surface: beam is werkes au angle of 6 with the normal. (a) for each beam, calculate the langle of reflection and the angle of refraction (if any). () Sko ON TW& DIAGRAM for each beam, the reflected ray and the transmitted (refracted) ray <if any? drawn at the augles found in part (a) Ans.(a) reflected Dreslet BEAM A transmitted Dresret" Sreflected Dreflect BEAM B (transmitted Drefrack Ans (SKETUERE RECTED REFRACTEY RAYS ON THE OTAGRAM mirror In a Physics 1202 laboratory experiment an illuminated object arrow is placed 12 cm to the left of a concaue mirror, and an inverted real image of the arrow is found to be projected on a screen held 8.0cm to left of the as shown in the diagrom (a) Calculate the focal length of of the mirror, object Ansaf (6) Calculate the imase/object height ratio m. Your auswer should be consistent with the diagram, which Converging Correctly shows a smaller, upside down imak. $.? 12.0 en 8.0 cm walmar Screen Aus (b)

Answer 1

Thiruestion, Ipbaped on the concept of enell is faband total Internal Reflections Critictical angle for airwater nitoface. critical angle tett means light ray will emerge along the medium berindry. noz Refractionamidex of water=133 Smo eat i ocz 48.75 133 in cans of incidenct angle is i> Oc than light ray will not energe and total internal Refrection will take place 1 Sorg o = new Smoc 133 soflash ligata with angle to will tramomix and angle coill ) Ismea no.sme. er emergent angleismez1338-40° e=58.75° 50-75 Ano a nazl no2 133 BeamA = Oreflect=40° cvery smallamont cöill reflect) =) Oretract = 58.75" tool A B Beams.) Scrurce Oreflect = 60° Orefreet = Neretraction Om Refraction sone Reflection alasayo takes place But im Reflection (TIR no refreaction tokes place.

6 The object distance u= 42.0cm Image distance v=_8cn by misserformula ! to the=/f =) < -1/2 = 14 t=-24 = -4.dan =_4.8cm (-8) magnification =- ū= --Ź -24 . 72 real; inverted and dininished, R=24 </20n