Question

When using a film camera, what must you do to bring an object into focus?

a.move the lens toward or away from the film.
b.close the diaphragm.
c.adjust the speed of the shutter.
d.adjust the angle of the mirror.

Answer 1

option (A) is correct

Step-by-step explanation:

To bring the object in focus, you can change the distance between the film and the lens by moving the lens towards or away from the film.

As the lens is used to click the pictures of objects which are placed at different distances from the camera.

By using the lens formula

1 / f = 1 / v - 1 / u

Where, f is the focal length of the lens, u be the distance between lens and the object and v be the distance between image and the lens.

We can say that f is constant and u is constant so, we have to change the value of v that means the distance between the lens and the film to focus the images of the objects on the film.

Answer 2

a. move the lens toward or away from the film.

Step-by-step explanation:

Lets discuss the function of different components of the camera

a). Lens : Lens position is set to focus the image on the film as we know that

`(1)/(d_i) + (1)/(d_0) = (1)/(f)`

here we know that position of lens can adjusted by changing the value of distance from object and that will help to focus the image on the film.

b). diaphragm. = It is used to control the intensity of light to enter into the lens so that light is adjusted.

c). speed of the shutter = By changing the speed of shutter we can control the light entering into the lens which can control the brightness of picture

d) Angle of mirror : by adjusting the angle of mirror we can set the orientation of the image that is formed