For a telescope to have large resolving power the 1. focal length of its objective should be large 2. focal length of its eye-piece should be large 3. focal length of its eye-piece should be small 4. aperture of its objective should be large its magnifying power When the length of a microscope tube increases November 15, 2020 Category: Cengage NEET by C.P Singh , Chapter 19 - Optical Instruments , Part 2 , Facebook Messenger WhatsApp Share this:TwitterFacebook Related