Q9.16Multiple correct
An astronomical refractive telescope has an objective of focal length 20m and an eyepiece of focal length 2cm.
- (a)The length of the telescope tube is 20.02m.
- (b)The magnification is 1000.
- (c)The image formed is inverted.
- (d)An objective of a larger aperture will increase the brightness and reduce chromatic aberration of the image.