Advertisements
Advertisements
प्रश्न
Explain the following term related to spherical lenses:- centres of curvature
Advertisements
उत्तर
Centre of Curvature:-
The centre of sphere of part of which a lens is formed is called the centre of curvature of the lens. Since concave and convex lenses are formed by the combination of two parts of spheres, therefore they have two centres of curvature. One centre of curvature is usually denoted by C1 and second is denoted by C2.
APPEARS IN
संबंधित प्रश्न
Explain the following term related to spherical lenses:- principal focus
Write the formula for a lens connecting image distance (v), object distance (u) and the focal length (f). How does the lens formula differ from the mirror formula?
A student obtained a sharp image of a burning candle, placed at the farther end of a laboratory table, on a screen using a concave mirror. For getting better value of focal length of the mirror, the subject teacher suggested him for focusing a well illuminated distant object. What should the student do?
(A) He should move the mirror away from the screen.
(B) He should move the mirror slightly towards the screen.
(C) He should move the mirror as well as the screen towards the newly selected object.
(D) He should move only the screen towards the newly selected object.
If a spherical mirror breaks, what type of mirrors are the individual pieces?
State the kind of mirror used
(a) By a dentist,
(b) As a search-light reflector.
Define the term Principle focus.
The distance from the pole to the focus is called ______.
In torches, search lights and headlights of vehicles the bulb is placed ______.
