FOR 59th the answer is 5R/6
CHANNA AIYA'S method is right but in the second step
the voltage of the marked positins are same so u can simplify the circuit like
the f number of a lense is N=F/D
so N = 45/30 =1.5
for 33 i think it is 3rd answer because
muhune sita ena aloka kirana ek thala darpanayak matha pathitha wi paarshawika apawarthanya wu prathibimbayak sadai. ema prathibimbaya anek darpanayata wasthuwa lesa kriya kara nawatha paarshawika apawarthanaya wu prathibimbayak saadana nisa pudgalayage muhuna paarshawika apawarthanaya nowu ek prathibimbayak se pene.
FOR 50th and 43 the answer is 3
i'm not going to explain that because it has explained above
GOOD LUCK NANGI !!!!!!!!!!!!!!!