Answer :

here u go!
fiber-Optics
Mirrors
Sonar
Radar
Study of seismic waves

optomety-contact/corrective lenses
binoculars periscopes and refracting telescopes and refracting telescopes
mangnifying glass
knowledge of refraction creates the most sparkly diamonds
prisms to divdide white light into it's into  it's component colours
certain optical illusions