Consider the following statements. 1. Photochromic lenses are lenses that darken on exposure to ultraviolet light. 2. Photochromic properties is due to embedded microcrystalline of silver chloride in the glass. Which of the statement(s) given above is/are correct? A. Only 1 B. Only 2 C. Both 1 and 2 D. Neither 1 nor 2

The correct answer is C. Both 1 and 2.

Photochromic lenses are lenses that darken on exposure to ultraviolet light. This is due to the embedded microcrystalline of silver chloride in the glass. When exposed to ultraviolet light, the silver chloride molecules break down and form silver metal. This silver metal absorbs visible light, which makes the lenses appear darker.

When the lenses are not exposed to ultraviolet light, the silver chloride molecules reform and the lenses return to their clear state.

Photochromic lenses are a type of sunglasses that provide protection from the sun’s harmful ultraviolet rays. They are also useful for people who are sensitive to bright light.