Immediatlyyy 20 ! brainliest goes to the fastest and correct answer pl william herschel is known for: inventing the achromatic lens inventing the reflecting telescope building the largest refractor making a 48-inch precision reflector

I believe it's inventing the reflecting telescope. He built his own telescope with a magnifying power of 6,450. He also discovered Uranus and its two moons Titania and Oberon, named after the famous Shakespeare characters, but that wasn't one of the choices. 

Ithink it’s c or b for the answer.