For a concave mirror, whenever the distance of the object is less than the focal length, the image is virtual. That is called virtual image, because :
A
the image is formed behind the mirror
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B
the image is not inverted
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C
the image cannot be obtained on screen
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D
the image can be located by virtue of parallax
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Solution
The correct options are A the image is formed behind the mirror C the image cannot be obtained on screen For a concave mirrors, if object is placed within focus, the image is virtual as it cannot be obtained on the screen. Ray diagram for concave mirror is given here.