A thick plane mirror shows a number of images | vedclass

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(B) When light is incident on a thick plane mirror,a small fraction of light is reflected from the front surface,while a much larger fraction enters t

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(B) When light is incident on a thick plane mirror,a small fraction of light is reflected from the front surface,while a much larger fraction enters the glass,undergoes multiple internal reflections at the silvered back surface,and then emerges from the front surface.$1$. The first reflection occurs at the front surface,which is a glass-air interface. Since the refractive index difference is small,only a small percentage (typically about $4\%$ to $10\%$) of the light is reflected,forming the first image.$2$. The light that enters the glass is reflected by the silvered back surface,which acts as a highly efficient mirror. This light then travels back through the glass and emerges from the front surface. Because this reflection occurs at the silvered surface,a much larger portion of the light is reflected,making the second image the brightest.$3$. Subsequent images are formed by further internal reflections,but each time the light emerges,its intensity decreases significantly due to partial reflection and absorption.Therefore,the second image is the brightest.

$A$ thick plane mirror shows a number of images of the filament of an electric bulb. Of these,the brightest image is the

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