Optical!!
In the defence of Syracuse, he used parabolic mirrors to focus the sun's rays into a column of heat directed at approaching wooden warships of the Roman fleet, setting them on fire.
A simple microscope an electron microscope is one that uses the focus of electron beams instead of regular light from lenses. It allowed scientists to discover new germ cells, bacteria, and eventually viruses. the simple microscope was invented in 1600s
Picasso's focus in art is absract.
The focus on small rural communities in pre-industrial Britain was the basis for mob football. It was used as a way for the people to gather, celebrate, and just have some communal fun. The Industrial Revolution led to extensive flight from these communities to the city and devalued the importance of mob football.
prohibition focus was stopping the legality of alcohol consumption.
the reflecting telescope uses mirrors and lenses. The refracting telescope does not include the mirrors.
the reflecting telescope uses mirrors and lenses. The refracting telescope does not include the mirrors.
optical telescope
The Hubble Telescope uses both mirrors and lenses to focus on images.
Newtonian telescope
Refracting telescope.
Refracting Telescope.
A telescope uses lens and mirrors to collect and focus light from distant object.
That device is a telescope.
Mirrors and lenses in telescopes bend and focus light to produce an image with more detail.
A Telescope uses lenses or mirrors to collect and focus light from distant objects. With the advancement in optical research we are capable to watch the stars and planets better than before. Our information about universe largely depend on telescopes.
Mirrors don't refract, they reflect. All lenses, on the other hand, refract (bend) the light. All cameras have lenses, to focus the image; same for eyeglasses. Some telescopes have lenses, but others are collections of mirrors. Note that some few optical elements are lenses and mirrors - like prescription sunglasses with mirror coating.