Question

Suppose you have a picture that is very underexposed (too dark). How would you improve the image quality?
A. You are allowed to change the focal length, but not the aperture size nor shutter speed
B. You are allowed to change the aperture size, but not the focal length nor shutter speed.
C. You are allowed to change the shutter speed, but not the focal length nor aperture size.
D. All of the above

Answer 1

Usually in cameras convex lenses are used to take pictures. These are used due to their ability to magnify an image of a distinct object. More external fetchers such as aperture and shutter are used in cameras for improving photographic experiences.

Complete answer:
The focal length of a lens is the distance of a point where the light coming from infinity distance diverts after refraction and the center of the lens. The focal point is denoted by $F$. The measurement of the focal length is usually dime in millimeters $\left( mm \right)$.
The longer the value of focal length higher will be the magnification and the narrower will be the angle of view.
Aperture size can be defined as the opening of the lens through which the light can pass and produce an image. It is expressed in f-numbers, to express the opening size of the lens. Example: $\left( \dfrac{f}{1.4},\dfrac{f}{2},\dfrac{f}{2.8}..... \right)$ .
It has the same functionality as that of the pupil of our eyes. The most important effect of the aperture size on the captured photograph is the brightness, or exposure, of the image.
The larger will be the aperture size, more light will be able to pass through the lens and brighter will be the image.
So, now when we look at the condition of the image mentioned in the question. To correct the image the aperture of the camera should be increased with the constant focal length and shutter speed.

Thus, from the above discussion, it is clear that the correction option which shows the value solution to the problem mentioned in the question is Option B.

Note:
The shutter speed is the measurement of the shutter opening time. It is measured in seconds. It is used to check the shake of the camera. Faster the shutter speed sooner will be the photograph to the subject without blur and freeze motion. All of the three parameters are important for a good photography experience.