Question. Which of the following is correct? (a) 2 parsec = 6.36 light year (b) 3 light year = I .89 x 105 astronomical unit (c) 4 fermi = 2 x 10-13 cm (d) 1 nanometre = 10-10 m Share with your friends Share 0 Pintu B. answered this Dear Student , 1 parsec=3.26156 light year3 light year = 1·89×105 astronomical unit4 fermi = 4×10-13cm1 nanometre=10-9 mSo here only second one is the correctly given .So second option is the correct option .Regards 1 View Full Answer