The focal lengths of the objective and eye lenses of a telescope are respectively 200 cm and 5 cm . The maximum magnifying power of the telescope will
The focal lengths of the objective and eye lenses of a telescope are respectively 200 cm and 5 cm . The maximum magnifying power of the telescope will be
A. `- 40`
B. `- 48`
C. `- 60`
D. `- 100`
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Correct Answer - B
Magnifying power of astronomical telescope,
`m=-(f_(o))/(f_(e ))(1+(f_(e ))/(D))=-(200)/(5)(1+(5)/(25))=-48`
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