To determine the part of speech of the underlined word "bright" in the sentence "The bright light hurt his eyes.", follow these steps:
Identify the meaning and role of the word "bright." Here, "bright" describes the noun "light."
The role of a word that describes or modifies a noun is that of an adjective.
Adjectives provide more information about a noun by specifying characteristics such as color, size, and quality. In this case, "bright" specifies the quality and appearance of "light."
Thus, the correct part of speech for bright is Adjective.