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

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

A

Convergent of crown and divergent of flint

B

Divergent of crown and convergent of flint

C

Both divergent

D

Both convergent

Answer

Convergent of crown and divergent of flint

Explanation

Solution

For achromatic telescope objective lens, convergent of crown and divergent of flint is the best combination because μcrown<μflint\mu_{crown} < \mu_{flint}