Question

Which gadgets/tools use both concave and convex lenses?
simple camera and magnifying glass

magnifying glass and microscope

microscope and telescope

telescope and simple camera

Answer 1

Telescope and simple camera.

Reason: A telescope (Galilean type) uses a convex objective and a concave eyepiece. Camera lens systems use both convex and concave elements to form a sharp image and correct aberrations. A magnifying glass is just a single convex lens, and a typical compound microscope uses two convex lenses (objective and eyepiece).