physics

Peter Dollond

Peter Dollond is a physics topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Peter Dollond rather than just read about it. In short: Peter Dollond (2 February 1731 – 2 July 1820) was an English inventor of optical instruments. He was the son of optician John Dollond.

Key takeaways

Peter Dollond belongs to physics; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Peter Dollond to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Peter Dollond from memory before moving on to harder problems.

Reference excerpt

Peter Dollond (2 February 1731 – 2 July 1820) was an English inventor of optical instruments. He was the son of optician John Dollond. He is known for his successful optics business, and for the invention of the apochromat.

Biography Dollond was born in Kensington. Working together with his father and subsequently with his younger brother and nephew (George Dollond) he successfully designed and manufactured a number of optical instruments. He is particularly credited with the invention of the triple achromatic lens - i.e., apochromatic lens - in 1763, still in wide use today, though known as the Cooke triplet after a much later 1893 patent. Peter Dollond worked at first silk weaving with his father, but his father's passion for optics inspired him so much that in 1750 Peter quit the silk business and opened an optical instruments shop in Kennington, London. After two years, his father gave up silk, too, and joined him. Dollond telescopes, for sidereal or terrestrial use, were amongst the most popular in both Great Britain and abroad for a period of over one and half centuries. Admiral Lord Nelson himself owned one. Another had sailed with Captain Cook in 1769 to observe the Transit of Venus. He was elected to the American Philosophical Society in 1772. The Peter Dollond compound chest microscope is based on improvements to the Cuff-style microscope introduced by British scientific instrument designers Edward Nairne and Thomas Blunt around 1780. Another design was for the Peter Dollond compound monocular Eriometer around 1790 used to accurately measure the thickness and size of wool fibres. After successfully defending a legal challenge to the patent he held for the achromatic lens the business prospered and he successfully sued his rivals for patent infringement. Dollond's reputation, especially with his father being a Fellow of the Royal Society as a result of his development and patenting of the achromat, provided the company with the de facto right of refusal on the best optical flint glass. This privilege permitted Dollond to maintain an edge in quality over competitor's telescopes and optical instruments for many years. Notable customers also included:

Leopold Mozart Frederick the Great Thomas Jefferson James Lind Dollond & Co merged with Aitchison & Co in 1927 to form Dollond & Aitchison, the well-known British high street chain of opticians. Peter Dollond's wife was Ann Phillips and they had two daughters, Louise and Anne.

References

External links Media related to Peter Dollond at Wikimedia Commons

Illustrations

Worked examples

Example 1 — a first encounter with Peter Dollond

Start with the simplest possible case. Write down what Peter Dollond claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In physics, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Peter Dollond before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Peter Dollond ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Peter Dollond

In research: Peter Dollond appears in physics research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Peter Dollond in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Peter Dollond is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1731 births, 1820 deaths, 18th-century English astronomers, so understanding it makes those chapters shorter.
In everyday life: Look for Peter Dollond outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Peter Dollond in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Peter Dollond means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Peter Dollond out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Peter Dollond in simple terms?

Peter Dollond (2 February 1731 – 2 July 1820) was an English inventor of optical instruments. He was the son of optician John Dollond.

Why does Peter Dollond matter?

Because it connects several physics ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Peter Dollond?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Peter Dollond.