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The focal lengths of the objective and e...

The focal lengths of the objective and eyepiece of a telescope are 60 cm and 5 cm respectively. Find as magnifying power (P) for normal adjustment and when the image forms at near point.

Text Solution

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1. Magnifying power for normal adjustment `= -(f_(o))/(f_(e)) = (-60)/(5) = -12`
2. Magnifying power for image at near point `= -(f_(o))/(f_(e))[1+(f_(e))/(D)]`
`= (60)/(5)[1+(5)/(25)]`
`= -14.4`
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