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प्रश्न
A concave mirror can be used to produce a parallel beam of light. Draw a ray to illustrate this.
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उत्तर
In the case of a concave mirror if the object is placed at a Focal point then ray emerging from it after reflecting from the mirror would be parallel to the principal axis.
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संबंधित प्रश्न
Explain the following term related to spherical lenses:- aperture
A diverging lens is used in:
(a) a magnifying glass
(b) a car to see objects on rear side
(c) spectacles for the correction of short sight
(d) a simple camera
The diverging lens in part (a) is replaced by a converging lens also of focal length 100 mm. The object remains in the same position and an image is formed by the converging lens. Compare two properties of this image with those of the image formed by the diverging lens in part (a).
AB and CD, two spherical mirrors, from parts of a hollow spherical ball with its centre at O as shown in the diagram. If arc AB = `1/2` arc CD, what is the ratio of their focal lengths? State which of the two mirrors will always form virtual image of an object placed in front of it and why.
Does the mirror mentioned in part (b) form real image for all locations of the object?
Define focal length.
What is the difference between virtual images of an object formed by a concave mirror and a convex mirror?
The distance from the center of curvature of the mirror to the pole is called the focal length of the mirror.
