Magnifying Glass — Practice

Question 1

What kind of lens is a magnifying glass?

Accepted Answer

✦ Answer: A CONVEX lens (curved outward, thicker in middle). It bends light to form a magnified, virtual image.

Question 2

Name three historical discoveries made using lenses.

Accepted Answer

Step 1 — Leeuwenhoek (1670s).
  Used hand-made microscopes to discover MICROORGANISMS ('animalcules') in pond water. Started microbiology. Father of Microbiology.

Step 2 — Hooke (1665).
  Used microscope to examine cork; observed cell-like structures and coined the term 'CELL'. Foundation of biology.

Step 3 — Galileo (1609).
  Used early telescope to discover:
  • Moons of Jupiter (4 — Galilean moons)
  • Mountains on Moon
  • Phases of Venus
  • Sunspots
  Founded modern astronomy.

Step 4 — Modern continuation.
  Today: cryo-electron microscopy sees individual atoms (Nobel 2017). James Webb Space Telescope sees 13 billion years back in time.

✦ Answer: Three major discoveries: (1) Leeuwenhoek discovered MICROBES (1670s, microbiology), (2) Hooke discovered CELLS (1665, biology), (3) Galileo discovered JUPITER'S MOONS (1609, astronomy). Each used simple lens technology to open vast new worlds.

Practice — Magnifying Glass

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