First slide

The optical instruments

Question

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

Moderate

A

Convergent of crown and divergent of flint
B

Divergent of crown and convergent of flint
C

Both divergent
D

Both convergent

Solution

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

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