Reflectively

1 clue
“I think I should use mirrors in my telescope,” Newton said ___
Similar answers:
Actively
Afterreflection
Alternatively
Attentively
Consecutively
Consecutivelyin
Constructively
Deceptively
Demonstratively
Effectively
Figuratively
Furtively
Gagreflecks
Inventively
Negatively
Positively
Reflect
Reflected
Reflectedimages
Reflectedin