A lens can be considered to be made up of a combination of different sections of ______.
A lens can be considered as a combination of different sections of
Which of the above optical systems (given that all surfaces are made of transparent glass and the bold surfaces represent mirrors) can be considered as a lens?
How many cylinder glasses of 3cm base radius and height 8cm can be refilled from a cylindrical vessel of base radius 15cm which is filled up to a height of 32 cm