An astronomical telescope of magnifying power `7` consists of two thin lenses `40 cm` apart, in normal adjustment. Calculate the focal lengths of the lenses.

An astronomical telescope of magnifying power 10 consists of two thin lenses 55 cm apart. Calculate the focal lengths of lenses.

An astronomical telescope of magnifying power 10 consists of two thin lenses 55 cm apart. Calculate the focal length of the lenses.

An astronomical telescope having a magnifying power of 8 consists of two thin lenses 45 cm apart. Find the focal length of the lenses.

An astronoical telescope consists of two thin lenses set 36 cm apart and has a magnifying power 8.Calculate the focal length of the lenses.

An astronomical telescope consists of two thin lenses set 36 cm apart and has a magnifying power 8. calculate the focal length of the lenses.

An astronomical telescope consists of two thin lenses set 36 cm apart and has a magnifying power 8. calculate the focal length of the lenses.

An astronomical telescope consists of the thin lenses, 36 cm apart and has a magnifying power 8 . Calculate the focal length of lenses. Two stars have an actual separation of one minute of arc. Find the angle of separation as seen through the telescope.

An astronomical telescope of magnifying power 8 is made using two lenses spaced 45cm apart.The focal length of the lenses used are

An astronomical telescope,when in normal adjustment has magnifying power 5.If the distance between two lenses is 24 cm,find the focal length of both the lenses.

The magnifying power of an astronomical telescope in the normal adjustment position is 20.If the length of the telescope is 105 cm in this adujustment ,find the focal lengths of the two lenses.