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Question
The automatic darkening of photochromatic glass is because of the presence of:
The automatic darkening of photochromatic glass is because of the presence of:
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Solution
The correct option is C silver bromide
The automatic darkening of photochromatic glass is because of the presence of silver halide crystals. They are usually made of glass and small crystals of silver bromide that darkened when exposed to light, just like old photographic films.The crystals used in the glass of such lenses are minuscule, both in number and size. Fewer than 0.1 % silver bromide crystals, which were 100 times thinner than a human hair, were used in early photochromic glasses.
The automatic darkening of photochromatic glass is because of the presence of silver halide crystals. They are usually made of glass and small crystals of silver bromide that darkened when exposed to light, just like old photographic films.
The crystals used in the glass of such lenses are minuscule, both in number and size. Fewer than 0.1 % silver bromide crystals, which were 100 times thinner than a human hair, were used in early photochromic glasses.
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