In urban areas, light pollution obscures the starry sky.

Mitsuko is my best friend.

Migihiro is my best friend.

A high-speed optical line is installed in my house.

The sun's photosphere is very bright and can be seen from Earth.

How do I adjust the light level in this room?

He adjusted the light levels of the lamp to change the atmosphere of the room.

Visible light is the range of light visible to the human eye.

I bought a new camera lens.

This computer can be used by anyone.