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Question

Object is placed between infinity and a device. Image formed is diminished and between pole and focus, behind it. If the image is virtual and erect, identify the device.

A
Convex mirror
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B
Concave mirror
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C
Spherical mirror
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D
Plane mirror.
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Solution

The correct option is A Convex mirror
As we know concave mirror and convex lens does not form erect image behind the device.
And the erect image formed by concave mirror behind the device is not diminished in size.
So,the device must be convex mirror.

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