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प्रश्न
Define the following term in the context of spherical mirrors:- Principal axis
उत्तर
Principal axis of a spherical mirror:-
The imaginary straight line joining the pole (P) and the centre of curvature (C) is termed as the principal axis.
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संबंधित प्रश्न
An image formed by a ______ mirror is always of the same size as that of the object.
Define the following terms in the context of spherical mirrors :
(i) Pole
(ii) Centre of curvature
(iii) Radius of curvature
(iv) Principal axis
Name the two kinds of spherical mirrors and distinguish between them.
Draw suitable diagrams to illustrate the action of (i) concave mirror and (ii) convex mirror on a beam of light incident parallel to the principal axis.
State the position of object for which the image formed by a concave mirror is of same size.
What is the relation between focal length and radius of curvature of a concave mirror?
The following Figure shows a concave mirror MM' on which a ray of light incident from a point P gets reflected to meet the principle axis at O.
(a) Find, by construction, the position of the centre of curvature of the concave mirror.
(b) Write down the value for the radius of curvature of the mirror.
(c) Calculate the focal length of the mirror.
(d ) Which relation is used in deducing the focal length from the radius of curvature?
Numerical problem.
The radius of curvature of a spherical mirror is 25 cm. Find its focal length.
A ray of light is incident towards a plane mirror at an angle of 30° with the mirror surface. What will be the angle of reflection?
A converging lens of focal length f is placed at a distance 0.3 m from an object to produce an image on a screen 0.9 m from the lens. With the object and the screen in the same positions, an image of the object could also be produced on the screen by placing a converging lens of focal length.
