Instrument used for listening sounds produced within the body is called
Mobile phone
Microscope
Stethoscope
Telescope
Instrument used for listening sounds produced within the body is called Stethoscope used by doctors.
Doctors use stethoscope to hear the sound ; Produced during each cardiac cycle. The second sound is heard when:
An optical instrument used for angular magnification has a 25 D objective and a 20 D eyepiece. The tube length is 25 cm when the eye is least strained.
(a) Whether it is a microscope or a telescope?
(b) What is the angular magnification produced?