Alight meter reports that a camera setting of 1125s at f/4.0 will give a correct exposure. but the photographer wishes to use f/16 to increase the depth of field. what should the shutter speed be?

18000 seconds.

Explanation:

Focus to diameter ratio

Shutter time = T₁ = 1125 s

Changing the focus to diameter ratio gives us

Ratio of the areas

Amount of light is the product of time and area

Shutter speed will be 18000 seconds.

we have been given a quadratic function and we need to restrict the domain such that it becomes a one to one function.

we know that vertex of this quadratic function occurs at (5,2).

further, we know that range of this function is .

if we restrict the domain of this function to either or , it will become one to one function.

let us know find its inverse.

upon interchanging x and y, we get:

let us now solve this function for y.

hence, the inverse function would be if we restrict the domain of original function to and the inverse function would be if we restrict the domain to .