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प्रश्न
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.
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उत्तर
The ratio of the focal lengths of mirrors AB and CD will be equal to one, as both mirrors are part of the same spherical ball. Hence, their radius of curvature and focal length will be the same.
The mirror AB will always form a virtual image when an object is placed in front of it because the mirror AB is a convex mirror.
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संबंधित प्रश्न
Write the mirror formula. Give the meaning of each symbol which occurs in it.
Name the two kinds of spherical mirrors and distinguish between them.
Figure shows a concave mirror with its pole at P, focus F and centre of curvature C. Draw ray diagram to show the formation of image of an object OA.
Draw a ray diagram to show the formation of the image, when the object is placed between optical centre and principal focus of a convex lens.
State the signs and values of magnifications in the above mentioned case.
What do you understand by the term real image?
Define the term Centre of curvature.
Define the term Focus of a concave mirror.
Draw a ray diagram to show that a convex mirror has a wider field of view.
An object 10 cm high is placed at a distance of 20 cm in front of a spherical mirror of focal length 25 cm. By scale drawing find the nature, position, and magnification of the image in the following case:
Concave mirror
