In Galilean telescope, if the powers of an objective and eye lens are respectively `+1.25D` and `-20 D`, then for relaxed vision, the length and magnification will be

In a terrestrial telescope, the focal length of objective is 90cm and of eye lens is 6 cm . If the final image is at 30cm , then the magnification will be

A Galilean telescope has objective and eyepiece of focal lengths 200 cm and 2cm respectively. The magnifying power of the telescope for normal vision is

An astronomical telescope has focal lengths 100cm & 10cm of objective and eyepiece lens respectively. When final image is formed at least distance of distinct vision, magnification power of telescope will be:

In an astronomical telescope, the focal length of objective lens and eye-piece are 150 cm and 6 cm respectively. In case when final image is formed at least distance of distinct vision. the magnifying power is

A Galilean telescope has objective and eye - piece of focal lengths 200 cm and 2cm respectively. The magnifying power of the telescope for normal vision is

The focal lengths of the objective and eye - lens of a microscope are 1cm and 5 cm respectively. If the magnifying power for the relaxed eye is 45 , then the length of the tube is

The focal lengths of the objective and eye - lens of a microscope are 1cm and 5 cm respectively. If the magnifying power for the relaxed eye is 45 , then the length of the tube is

Is angular magnification of a telescope equal to ratio of diameters of objective and eye lens ?