In an astronomical telescope, focal leng...

In an astronomical telescope, focal length of the objective is made

half that of the eye-piece

equal to that of the ey piece

shorter than that of the ey-piece

greater than that of the ey-piece

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In an astronomical telescope , the focal length and the aperture of the objective are …… and the focal length and the aperture of the eyepiece are taken …… as compared to those of the objective [fill in the blank].

To observe terrstrial bodies the angular magnification of a telescope is 5 . The distance between the objective and the eyepiece is 36 cm and the final image is formed at infinity . Determine the focal lengths of the objective lens and eyepiece lens.

Is the length of the instrument to be changed if the focal length of the objective of an astronomical telescope is increased ?

A planet is observed by an astronomical reflecting telescope having an objective of focal length 16 m and eyepiece of focal length 2 cm

The final image is an astronomical telescope is …….and ……..with respect to the object [fill in the blank] .

The magnifying power of an astronomical telescope for normal vision is 10 . The focal length of the objective is 20 cm . What will be the magnifying power for focussing the final image formed at a distance of 25 cm from the eyepiece ?

The length of the tube of an astronomical telescope is 80 cm and the magnifying power of the instrument is 19 . Calculate the focal lengths of the objective and the eyepiece.

A small astronomical telescope has an objective of focal length 50 cm and an eyepiece of focal length 5 cm . It is focussed at the sun and the final image is formed at a distance of 25 cm from the eyepiece . If the diameter of the sun subtends an angle of 32' at the centre of the objective calculate the angular magnification of the instrument and the actual size of the image.

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