When a student looks into a plane mirror, she sees a virtual image of herself. However, when she looks into an unpolished glass surface, the image is not seen clearly. Which light phenomenon is responsible for the image not being seen clearly?

The correct option is B Irregular reflection
When the student looks into the plane mirror, regular reflection takes place and a proper image is formed.

However, when the student looks into the unpolished glass surface, due to the nature of the surface, the light that is reflected is irregular /diffused in nature, so it is reflected in all directions.

Hence, no definite image is formed and the student cannot see her image clearly.

Hence, option (b) is the correct answer.

$\begin{array}{c}\text{Why this Question}?\\ \text{This question is based on practical application of regular/ irregular reflection.}\\ \end{array}$