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.

This lens is used for light concentration.

This lens is used to concentrate light.

He was hesitant to start a new business, but I encouraged him by saying, 'There is a danger of tragedy in any attempt.'

There is a state-of-the-art electron microscope in my laboratory.

The Yata no Kagami is a sacred mirror that appears in Japanese mythology.

He monitored the enemy's movements using a periscope.

I used an optical microscope for an experiment at school.

When I look into her eyes, it's like I can see her heart. That's because the eyes are the window to the soul.