Large astronomical telescopes always use ___________ as o...
Large astronomical telescopes always use ___________ as objective
lens
mirror
combinations of lenses
None of the above
Correct answer is C
No explanation has been provided for this answer.
A metallic sphere is heated from 27°C to 200°C Without change of state. Which of the fo...
The silvered walls of a vacuum flask minimise loss of heat due to ...
A hot metal ball is suspended in the open air. As it cools it loses heat by? ...