The focal length of the lensese of an as...

The focal length of the lensese of an astronomical telescope are 50 cm and 5 cm. The length of the telescope when the image is formed at the least distance of distinct vision is

45 cm

55 cm

`275/6cm`

`325/6`cm

Text Solution

Verified by Experts

The correct Answer is:

(d) Length of the telescope when final image is formed at least distance of distinct vision is,
`L=f_(o)+u_(e)=f_(o)+(f_(e)D)/(f_(e)+D)=50+(5xx25)/(5+25)=325/6cm`

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