Help please Physics ATP?

[xxvvyy]

http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20O%20Level/Physics%20(5054)/5054_w04_qp_4.pdf

question no 4, i need diagram to explain

 

[aden]

http://www.xtremepapers.com/papers/...onal O Level/Physics (5054)/5054_w04_qp_4.pdf

question no 4, i need diagram to explain

draw straight line Real long line through O P1 P2..past da prism.......same forP3 n p4 so both intersect....den measur da angle made in da right hand side of da ntersection
to draw refracts ray jst join da line in prism....emrgent wali aur refractd wali jahan prism ko tuch krti hain.
den to make eye E.....mesure 25cm......from object O....so it liz on p3 n p4 line
den draw normal simply on incidnt ray at prism...P1 P2 wali line...........and label it.