What value of d gives f = 30 cm ?
Answer & explanation
Correct answer: option 3
f = 30 cm then 30 = $\frac{216}{6+d}$
6 + d = 7.2 hence d = 1.2 cm.
What value of d gives f = 30 cm ?
Correct answer: option 3
f = 30 cm then 30 = $\frac{216}{6+d}$
6 + d = 7.2 hence d = 1.2 cm.