गोलीय दर्पण की वक्रता त्रिज्या और फोकस दूरी में संबंध (Relation between radius of curvature and focal length of a spherical mirror)|दर्पण सूत्र (Mirror Formula)|रैखिक आवर्धन (Linear Magnification)|f और v के पदों में रैखिक आवर्धन m (Linear Magnification m in terms of f and v)|OMR

The formula for linear magnification of a spherical mirror is m=(h_(2))/(h_(1))= (-v)/(u) . What determines the sign of m? What is the signification of the sign?

कोणीय संवेग (Angular Momentum)|कोणीय संवेग का सदिश रूप (Vector form of Angular Momentum)|कोणीय संवेग और बल आघूर्ण में संबंध (Relation Between Angular Momentum and Torque)|कोणीय संवेग का ज्यामितीय अर्थ (Geometrical Meaning of Angular Momentum)|जड़त्व आघूर्ण (Moment of Inertia)|किसी पिंड के जड़त्व आघूर्ण के लिए व्यंजक (Expression for M.I. of a Body)|जड़त्व आघूर्ण का भौतिक महत्व (Physical Significance of Moment of Inertia)|घूर्णन त्रिज्या या परिभ्रमण त्रिज्या (Radius of Gyration) |घूर्णन गतिज ऊर्जा (Rotational Kinetic Energy)|OMR

The formula governing reflection of light from a spherical mirror is (1)/(v) + (1)/(u) = (2)/(R ) , where u = distance of object from pole of mirror, upsilon = distance of image from pole of mirror f = focal length of mirror, R = radius of curvature of mirror. This is known as mirror formula and is applicable equally to concave mirror and convex mirror. m = (I)/(O) = (upsilon)/(u) Read the above passage and answer the following questions : (i) An object is held at a distance of 30 cm in front of a concave mirror of radius of curvature 40 cm . Calculate distance of the image from the object ? What is linear magnification of the mirror ? (ii) The object is moved to a distance of 40 cm in front of the mirror. How is focal length of mirror affected ? (iii) What values of life do you learn from the mirror formula ?

A short linear object is placed at a distance u along the axis of a spherical mirror of focal length f. a. Obtain an expression for the longitudinal magnification. b. Also, obtain an expression for th eration of the velocity of image (v) to the velocity of the object (u).

Lens (लेन्स)-Power Of Lens (लेन्स की क्षमता)|Change In The Power Of Lens (लेन्स की क्षमता में परिवर्तन)|Mirror Formula (दर्पण सूत्र)|Magnification (आवर्धन)|Summary

Lens (लेन्स)-Power Of Lens (लेन्स की क्षमता)|Change In The Power Of Lens (लेन्स की क्षमता में परिवर्तन)|Mirror Formula (दर्पण सूत्र)|Magnification (आवर्धन)|Summary

Assertion :– For a plane mirror the focal length is infinite and magnification is 1. Reason : - Because F = (R )/(2 ) = prop and m =- (V )/(-u) =+ 1.