A Looking Glass; Don’t Break It If You Want Luck

Puzzle 13 of Good luck Easy Pack

Question is: A Looking Glass; Don’t Break It If You Want Luck

and the answer is: MIRROR

Word Meaning:

MIRROR — A smooth surface, usually made of glass with reflective material painted on the underside, that reflects light so as to give an image of what is in front of it.

Definitions from Wiktionary.