Final answer:
Concave mirrors are used as make-up mirrors because when the object is within the focal point, an enlarged, upright virtual image is created, opposite to the reason provided which wrongly states a diminished image.
Step-by-step explanation:
The student's question is regarding why concave mirrors are used as make-up mirrors, and if a diminished image is seen when the face is held within the focus of a concave mirror. The assertion (A) is that concave mirrors are used as make-up mirrors, while the reason (R) provided is that a diminished image is seen. However, the reason should actually state that when the face is held within the focus of a concave mirror, an enlarged, upright virtual image of the face is seen, which is useful for makeup application.
Concave mirrors can form various types of images depending on the position of the object relative to the focal point. When an object is placed within the focal point of a concave mirror, the reflected rays diverge and the observer perceives them as originating from a point behind the mirror. This results in an upright and enlarged virtual image, making it ideal for tasks requiring attention to detail, such as applying makeup.
In contrast, convex mirrors are diverging mirrors which always produce an image that is virtual, upright, and smaller than the object. Thus, concave mirrors, not convex mirrors, are preferred for make-up mirrors to provide a larger view.