Question

1/f = (1.5/1.33-1) (1/20+1/30) = ?
plz solve thise question .​

Answer 1

Answer:

94.27380

Step-by-step explanation:

1/f= (1.5/1.33-1)(1/20+1/30)

(1.1278-1)(0.05+0.033)

(0.1278)(0.083)

0.01060

f = 1/0.01060

= 94.27380

Answer 2

Answer:

1/f=(1.5/1.33-1) (1/20+1/30)

(1.5-1.33/1.33) (3+2/60)

(0.17/1.33) (5/60)

17/133×1/12

17/1596