Question

u=
-100cm
V= -75cm
f=
?​

Answer 1

Explanation:

1/f=1/v-1/u

1/f=1/-75+1/100

1/f=-75+100/-7500

1/f=25/-7500

1/f=-25/7500

1/f=1/300

f=300

Answer 2

Answer:

300 is your answer dear.............