What is the difference between a pylon and an obelisk?

is that obelisk is a tall, square, tapered, stone monolith topped with a pyramidal point, frequently used as a monument while pylon is a gateway to the inner part of an ancient egyptian temple.

Explanation:

I kinda searched it up hehe

changeable lenses of different focal lengths allow light to enter the camera, which then forms the image on light-sensitive film" is the one among the following statements about working principle behind a basic still camera is true.