Question

transparent photographic films gradually change their colour when exposed to light due to what? ​

Answer 1

A strip or sheet of transparent plastic film base is coated with gelatin emulsion containing small light sensitive silver halide crystals on one side. When the exposed silver halide grains are developed, they are converted to metallic silver which appears as the black part of the film due to blocking of light.

Answer 2

Answer:

$<div style="color: #FFFFFF; font: normal 18px arial, sans-serif; background-color: #347c17; border: #ff0000 4px solid; width: 70%; margin: 0 auto; padding: 4px 5px 3px 5px; -moz-border-radius: 17px; -webkit-border-radius: 17px; border-radius: 17px; -moz-box-shadow: 5px 5px 5px rgba(0, 0, 0, 0.20); -webkit-box-shadow: 5px 5px 5px rgba(0, 0, 0, 0.20); box-shadow: 5px 5px 5px rgba(0, 0, 0, 0.20);"><marquee scrolldelay="250"><b><u>Hello</u> </b></marquee>$

$<p style="color:cyan;font-family:cursive;background:black;font size:40px;">..</p>$ A strip or sheet of transparent plastic film base is coated with gelatin emulsion containing small light sensitive silver halide crystals on one side. When the exposed silver halide grains are developed, they are converted to metallic silver which appears as the black part of the film due to blocking of light.

$<p style="color:blue;font-family:cursive;background:pink;font-size:30px;">Hope it helps Dear..</p>$

Explanation:

❤❤