A method for controlling contrast and density in negatives and prints.

A technique for focusing a camera lens.

A system for measuring light intensity.

A method for determining the correct exposure for a photograph.

To achieve a desired tonal range in a photograph.

To ensure accurate focus.

To determine the correct exposure for a photograph.

To control the depth of field in a photograph.

5

10

15

20

Focus is not related to the Zone System.

Focus is used to determine the zone in which a subject will fall.

Focus is used to control the depth of field in a photograph.

Focus is used to determine the correct exposure for a photograph.

By focusing on a subject close to the camera.

By focusing on a subject far from the camera.

By using a wide aperture.

By using a narrow aperture.

Focus and exposure are independent of each other.

Focus affects the exposure of a photograph.

Exposure affects the focus of a photograph.

Focus and exposure are both determined by the aperture of the lens.

By focusing on a subject close to the camera.

By focusing on a subject far from the camera.

By using a wide aperture.

By using a narrow aperture.

The distance at which a lens is focused to achieve maximum depth of field.

The distance at which a lens is focused to achieve minimum depth of field.

The distance at which a lens is focused to achieve a sharp image of a subject at a specific distance.

The distance at which a lens is focused to achieve a sharp image of a subject at infinity.

$$H = rac{f^2}{Nc}$$

$$H = rac{f}{Nc}$$

$$H = rac{f^2}{N}$$

$$H = rac{f}{N}$$

The hyperfocal distance is the same as the depth of field.

The hyperfocal distance is half the depth of field.

The hyperfocal distance is twice the depth of field.

The hyperfocal distance is unrelated to the depth of field.

By changing the aperture of the lens.

By changing the focal length of the lens.

By changing the distance between the camera and the subject.

By changing the film or sensor size.

The depth of field is directly proportional to the circle of confusion.

The depth of field is inversely proportional to the circle of confusion.

The depth of field is unrelated to the circle of confusion.

The circle of confusion is unrelated to the depth of field.

The depth of field is directly proportional to the format of the film or sensor.

The depth of field is inversely proportional to the format of the film or sensor.

The depth of field is unrelated to the format of the film or sensor.

The format of the film or sensor is unrelated to the depth of field.

The depth of field is directly proportional to the subject distance.

The depth of field is inversely proportional to the subject distance.

The depth of field is unrelated to the subject distance.

The subject distance is unrelated to the depth of field.