16. Consider the following statements.
1. Photochromic lenses are lenses that darken on exposure to ultraviolet light.
2. Photochromic properties is due to embedded microcrystalline silver chloride in the glass.
 

Which of the statement (s) given above is/are correct?

1. Only 1

2. Only 2

3. Both 1 and 2

4. Neither 1 nor 2

Correct Answer :

Both 1 and 2