He attached a new reflector to his bicycle.

His reflexes are very sharp.

When light hits a mirror, the angle of incidence and the angle of reflection become equal.

The spinal reflex is a part of our body that reacts automatically.

He is wearing a jacket with reflective material for night running.

He reflexively dodged the ball.

He loves physics and studies it in the library almost every day.

I am majoring in physical chemistry at university.

He is a world-famous physicist.

He is an expert in physics.