Question

Tolong dibantu iya..
no 13 dan 19 nya

Answer 1

13. Fob = x, Fok = y
perbesaran = x/y = 7
panjang teleskop = x + y = 160
y= 160 - x
x/ 160-x = 7
x = 1120 - 7x
8x =1120
x = 140
y = 160 - 140 = 20 cm

19. saya kurang tau

Answer 2

13.
M = 7
Fob/fok = 7
160/fok = 7

160 - 140 
Fok = 20 cm

19.
S’ob + fok = d
S’ob + 1,6 = 17,5
S’ob = 15,9 cm
1/sob = 1/fob – 1/s’ob = 1/0,65 – 1/15,9
1/sob = (15,9 – 0,65)/10,335
Sob = 10,335/ 15,25 = 0,677 cm
M = (s’ob/sob) . (Sn/fok)
M = (0,677/0,65) . (25/1,6)
M = 1,042 . 15,625
M = 398 kali