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Optical instruments are of great utility. They help us in studying very tiny objects as well as…
Optical instruments are of great utility. They help us in studying very tiny objects as well as very large heavenly bodies. Scientists have developed microscopes like electron microscopes which aid in studying tiny molecules of matter. They have also devised giant telescopes like Hubble telescope and James Web Space telescope which have enabled us to view distant galaxies hitherto unknown.
Read the passage given below and answer the questions that follow:
(i)[1.0]
Which optical instrument is used to study detailed structure of a virus?
(ii)[1.0]
What is the ability of an instrument to form an enlarged image of an object called?
(iii)[1.0]
Hubble telescope orbits around the earth like a satellite. What is the advantage of such a telescope over a similar one on earth’s surface?
(iv)[2.0]
An astronomical telescope consists of two convex lenses having focal length of $200\text{ cm}$ and $4\text{ cm}$. When it forms final image at infinity, calculate its:
(a) Magnifying power
(b) Length.
Answer
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From ISC 2023 Specimen Physics Paper 1, question 20.