Instructions: You are given a passage. Using the information present in the passage, you need to classify it into one of the 10 topics: 0 - 'Society & Culture', 1 - 'Science & Mathematics', 2 - 'Health', 3 - 'Education & Reference', 4 - 'Computers & Internet', 5 - 'Sports', 6 - 'Business & Finance', 7 - 'Entertainment & Music', 8 - 'Family & Relationships', 9 - 'Politics & Government'.
Input: When a mirror is hit by particles of light called photons, it reflects the photons back to us. When photons hit a smooth surface like a mirror, they bounce back off of the mirror at roughly the same angle at which they hit the object, creating a reflection that looks the same.
Output:
1