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The focal length of the field lens (which is an achromatic combination of two lenses) of telescope is . The dispersive powers of the two lenses in the combination are 0.024 and 0.036. The focal lengths of two lenses are

a)

30  and

b)

30  and

c)

45  and

d)

15  and



Question ID - 152453 | SaraNextGen Top Answer

The focal length of the field lens (which is an achromatic combination of two lenses) of telescope is . The dispersive powers of the two lenses in the combination are 0.024 and 0.036. The focal lengths of two lenses are

a)

30  and

b)

30  and

c)

45  and

d)

15  and

1 Answer
127 votes
Answer Key / Explanation : (b) -

(b)

For achromatic combination and

Solving above equations we get

127 votes


127