Answer:
The correct answer is "Her father is nearsighted and wears concave lenses to correct it".
Step-by-step explanation:
In ophthalmology, concave lenses are prescribed for people that suffers from a nearsighted vision. The concave lenses are thicker around the edges, which causes that the light diverges when it passes through it. This helps to correct the nearsighted vision, and in addition, makes that everything looks smaller when you look through it. This description fits with what Mavis looked when she looked through her father’s glasses. Therefore we can conclude that her father is nearsighted and wears concave lenses to correct it.