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Q.

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

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a

Convergent of crown and divergent of flint

b

Divergent of crown and convergent of flint

c

Both divergent

d

Both convergent

answer is A.

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Detailed Solution

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