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 of magnifying power 10 consists of two thin lenses 55 cm apart. Calculate the focal length 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 having a magnifying power of 8 consists of two thin lenses 45 cm apart. Find the focal length of the lenses.

An astronomical telescope has a magnifying power 10. The focal length of eyepiece is 20 cm . The focal length of objective is

An astronomical telescope has a magnifying power 10. The focal length of the eye piece is 20 cm. the focal length of the objective is -

If the tube length of astronomical telescope is 105 cm and magnifying power is 20 for normal setting, then the focal length of the objective is .......... cm.

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.