Question

The exposure index EI for a 35 millimeter camera is a measurement of the amount of light that hits the film. It is determined by the equation EI = log

Answer 1

Answer:

EI = 7

Step-by-step explanation:

The exposure index formula given is:

$EI=log_{2}(\frac{f^2}{t})$

Where

f is the f-stop setting

t is the exposure time in seconds

Given, the

f-stop setting = 16

t = 2 seconds

We substitute and use log calculator to find our EI, exposure index:

$EI=log_{2}(\frac{f^2}{t})\\EI=log_{2}(\frac{(16)^2}{2})\\EI=log_{2}(\frac{256}{2})\\EI=log_{2}(128)\\EI=7$