Advertisements
Advertisements
प्रश्न
Explain the following term related to spherical lenses:- optical centre
उत्तर
Optical centre:-
The central point of the lens is known as optical centre. It is represented as O. The optical centre of a lens has a property that a ray of light passing through it does not suffer any deviation and goes straight.
APPEARS IN
संबंधित प्रश्न
What is the relation between the focal length and radius of curvature of a spherical mirror (concave mirror of convex mirror)? Calculate the focal length of a spherical mirror whose radius of curvature is 25 cm.
A concave lens produces an image 20 cm from the lens of an object placed 30 cm from the lens. The focal length of the lens is:
(a) 50 cm
(b) 40 cm
(c) 60 cm
(d) 30 cm
Define the terms pole, principal axis and centre of curvature with reference to a spherical mirror.
Why does a driver use a convex mirror instead of a plane mirror as a rear view mirror?
Illustrate your answer with the help of a ray diagram.
An object of height 2 cm is placed at a distance of 20 cm in front of a concave mirror of a focal length of 12 cm. Find the position, size, and nature of the image.
Select the correct option:
A mirror forms a virtual image (diminished) of an object, whatever be the position of object:
Define the term Centre of curvature.
Which of the following has curved reflecting surface?
The spherical mirror used in a beauty parlour as make-up mirror is _______.
The minimum length of the mirror required to see the full image of the person is half ‘ of his height.
