Optics Question 374

Question: An achromatic telescope objective is to be made by combining the lenses of flint and crown glasses. This proper choice is

[CPMT 1977]

Options:

A) Convergent of crown and divergent of flint

B) Divergent of crown and convergent of flint

C) Both divergent

D) Both convergent

Show Answer

Answer:

Correct Answer: A

Solution:

For achromatic telescope objective lens, convergent of crown and divergent of flint is the best combination because $ {\mu _{crown}}<{\mu _{flint}} $



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