An astronomical telescope has objective and eye-piece lenses of focal length 3.5m and 5cm respectively. Determine the magnifying power of the telescope when in normal adjustmentA 70B 17.5C 7.0D 0.7

The distance between the two lenses in an astronomical telescope is 157 cm. It has a magnification of -44.0 .(a) Determine the focal length of the eyepiece. (b) Determine the focal length of the objective.

Find the magnifying power of a compound microscope whose objective and eyepiece are of focal lengths 4.0 cm and 6.0 cm respectively and the object is placed 5.0 cm beyond the objective. Assume that the final image is formed at the least distance of distinct vision (25 cm)

When the telescope eyepiece is changed from 20-mm to 50-mm(Select All the answers that are correct)Group of answer choicesthe magnification is decreasedthe magnification is increasedthe field of view is decreasedthe field of view is increasedthe brightness of the object is decreasedthe brightness of the object is increased

The magnification produced by a concave lens of power P is 1/2 for an object placed at a distance of 20cm from it. Calculate P.

The diameter of the objective lens of a small telescope is 63 mm. Determine the wavelength of light passing through the telescope if the resolution is 9.2 ×10−6 radians