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प्रश्न
An image that cannot be obtained on a screen is called ______.
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उत्तर
An image that cannot be obtained on a screen is called virtual image.
Explanation:
A virtual image is formed by diverging light rays and appears to be located behind the lens or mirror, making it impossible to project onto a screen.
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संबंधित प्रश्न
Which type of mirror can form a real image?
A ray of light is incident normally on a plane mirror. What will be the
angle of incidence?
Define the following terms in the context of spherical mirrors :
(i) Pole
(ii) Centre of curvature
(iii) Radius of curvature
(iv) Principal axis
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.

How is the focal length of a spherical mirror related to its radius of curvature?
An object of height 2 cm is placed at a distance of 20 cm in front of a concave mirror of a focal length of 12 cm. Find the position, size, and nature of the image.
Define the following term:
convex mirror
Define the term principal focus in case of convex mirror. Draw a convex mirror and show its principal focus and focal length clearly.
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
A student traces the path of a ray of light passing through a rectangular slab.
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For measuring the angle of incidence, he must position the protractor in the manner shown in the figure:




