Some facts about photography lens are given. The answers are to be stated as per the given conditions. Concept introduction: Photography lenses contain silver chloride. Silver chloride is light sensitive. To determine: The explanation for the difference in the fact that, when the light is removed from the decomposition reaction of white silver chloride, the reverse reaction occurs but when pure white silver chloride is exposed to sunlight it darkens and the reverse reaction does not occur in the dark.

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Chapter 19, Problem 79AE

(a)

Interpretation Introduction

Interpretation: Some facts about photography lens are given. The answers are to be stated as per the given conditions.

Concept introduction: Photography lenses contain silver chloride. Silver chloride is light sensitive.

To determine: The explanation for the difference in the fact that, when the light is removed from the decomposition reaction of white silver chloride, the reverse reaction occurs but when pure white silver chloride is exposed to sunlight it darkens and the reverse reaction does not occur in the dark.

(b)

Interpretation Introduction

Interpretation: Some facts about photography lens are given. The answers are to be stated as per the given conditions.

Concept introduction: Photography lenses contain silver chloride. Silver chloride is light sensitive.

To determine: An explanation for the reason that, photography lenses do become permanently dark in time.

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