He was observing the stars with a telescope.

In physics class, I learned about the properties of convex mirrors.

He conducted an experiment using a spherical lens.

The speculum of this bird has a very beautiful color.

This magic mirror came from China.

He is good at reading mirror writing.

My mother always said, 'A well-slept child is a well-kept child,' and encouraged me to go to bed early.

He likes to take a walk in the park at dusk.

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.