Supposing a patient has Tinea Capitis (Ringworm of the scalp) what will you see under a magnifying glass?
Probably nothing diagnostic would be seen using a handheld magnifying lens. Preferably one would use a microscope but that also has limitations.
Microscopic examination of the infected hairs may provide immediate confirmation of the diagnosis of ringworm and establishes whether the fungus is small-spore or large-spore ectothrix or endothrix.
You will see hyphae (which produce spores that appear as crusted plaque-likelesions on the scalp)