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Q.

A short straight object of height 100 cm lies before the central axis of a spherical mirror whose focal length has absolute value f = 40cm . The image of object produced by the mirror is of height 25 cm and has the same orientation of the object. One may conclude from the information: 

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a

Image is real, same side of convex mirror

b

Image is virtual, opposite side of concave mirror

c

Image is virtual, opposite side of convex mirror

d

Image is real, same side of concave mirror

answer is A.

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Detailed Solution

Magnification (m) is given by
m= height of the image  height of the object =25cm100cm=14
Image is diminished and magnification is positive 
 It is possible if object is placed in front of convex mirror.

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