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प्रश्न
Define (i) principal focus of a concave mirror, and (ii) focal length of a concave mirror.
उत्तर
Definitions-
(i) Principal focus (F) of a concave mirror – Focus of a concave mirror is the point at which the incident rays, parallel to the principal axis, actually meet after reflecting from the concave mirror.
(i) Focal length (f) – Focal length of a concave mirror may be defined as the distance between its focus and pole.
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संबंधित प्रश्न
"A concave mirror of focal length 15 cm can form a magnified, erect as well as inverted image of an object placed in front of it." Justify this statement stating the position of the object with respect to the pole of the mirror in both the cases for obtaining the images.
To construct ray diagrams, two rays of light are generally so chosen that it is easy to determine their directions after reflection from a mirror. Choose two such rays and state the path/direction of these rays after reflection from a concave mirror. Use these two rays to find the position and nature of the image of an object placed at a distance of 8 cm from a concave mirror of focal length 12 cm.
Draw a ray diagram showing how a concave mirror can be used to produce a real, inverted and diminished image of an object.
Explain why, concave mirrors are used as shaving mirrors.
According to New Cartesian Sign Convention:
(a) focal length of concave mirror is positive and that of convex mirror is negative
(b) focal length of both concave and convex mirrors is positive
(c) focal length of both concave and convex mirrors is negative
(d) focal length of concave mirror is negative and that of convex mirror is positive
An object is placed at a distance of 10 cm from a concave mirror of focal length 20 cm.
An object is placed at a distance of 10 cm from a concave mirror of focal length 20 cm.
State two characteristics of the image formed.
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a convex mirror?
Name the mirror(s) that can give (i) an erect and enlarged image, (ii) same sized, inverted image
An object at a distance of 30 cm from a
concave mirror gets its image at the same point. The focal length of the mirror is ______.
