Nothing was visible until the officer of the deck changed the optical power from low to medium.
To make images clear for objects at different distances from the eye, its optical power needs to be changed.
Since the source needs to be small, such an optical system cannot produce much optical power.
The quantity 1/f is also known as the optical power of the lens.
For genuinely high optical power, much light would be required on the slide.
One can compare the present optical power of each wavelength to the designed values and look for differences.
The connection between optical power and voltage in an imaging system is linear.
Some optical power is lost into clad due to these modes.
Such a material can be used to limit the amount of optical power entering a system.
Light entering the eye passes first through the cornea, which provides much of the eye's optical power.