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Byju's Answer
Standard VII
Physics
Image Formation by Lenses
The image of ...
Question
The image of an object formed by a device is always virtual and small. The device may be
A
A glass plate
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B
A concave mirror
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C
A convex lens
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D
A concave lens
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Solution
The correct option is
D
A concave lens
The image of an object formed by a concave lens is always virtual and small
Hence, the device is concave lens.
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Q.
A student determines the focal length of a device X, by focussing the image of a far off object on the screen positioned as shown in the figure alongside.
The device X is a :
(1) Convex lens
(2) Concave lens
(3) Convex mirror
(4) Concave mirror