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प्रश्न
Explain the following term related to spherical lenses:- principal axis
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उत्तर
Principal Axis:-
The principal axis of a lens is a line passing through the optical centre of the lens and perpendicular to both the faces of the lens.
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संबंधित प्रश्न
A student obtains a sharp image of the distant window (W) of the school laboratory on the screen (S) using the given concave mirror (M) to determine its focal length. Which of the following distances should he measure to get the focal length of the mirror?
Explain the following term related to spherical lenses:- centres of curvature
What type of image is formed:
- in a plane mirror?
- on a cinema screen?
What is the relation between the focal length and radius of curvature of a spherical mirror (concave mirror or convex mirror)?
Define the terms pole, principal axis and centre of curvature with reference to a spherical mirror.
Name the kind of mirror used to obtain:
A virtual and diminished image
A spherical mirror whose reflecting surface is curved outwards is called ______ mirror.
What is “aperture”?
