Answer:
d.The wavelength of light and the size of the aperture
Step-by-step explanation:
The resolution power of an optical system is the smallest distance between two points that the device can distinguish clearly.
It has the following relationship:
![r=(\lambda)/(2n)](https://img.qammunity.org/2020/formulas/physics/high-school/8mgnb2z7xag2kgs8btkomdcp9cf8lcndvp.png)
where:
r = minimum resolvable distance
n = numerical aperture
= wavelength of the light used for viewing
From above mathematical equation it is clear that:
- Smaller the wavelength better the resolving power
- Larger the aperture better the resolution
(Note, that smaller the value of "r" the more finer details of the image visible through the device.)