A. Testing the heartbeat
B. Magnifying small objects
C. None of these
D. Aiding the blind to write
🧠 Explanation:
A scotograph is an instrument designed to assist blind individuals in writing. It provides a tactile guide, typically through a frame or template, allowing users to form letters and words without visual input. By aligning paper within a structured grid or using raised markers, the scotograph ensures accurate writing for those with visual impairments. This tool, though less common in the digital age, historically empowered blind individuals to communicate independently in written form. Its development reflects early efforts in accessibility technology, contributing to inclusive education and communication for visually impaired communities across various contexts.
