An obj{r 2.4 m in tront of a letu form a
shrp image 6n a filrn 12 cn behid th€
l€s. A glass plat€ 1m thick of €fnctive
indd 1.50 is inle.po*d kws les and
iilm witi itl llane faces Paiallel lo firn
At whar distafte (from lere) shodd obj&t
b€ snifkd to be in sharP l@s d 61
Comments
Leave a comment