An object of height 7cm kept at a distance of 25cm in front of a concave mirror. The focal length of the mirror is 15 cm. At what distance from the mirror should a screen bekept so as to get a clear image? Whatwill be the size and nature of theimage?

An object of height 7cm kept at a distance of 25cm in front of a conca

1.	An object of height 7cm kept at a distance of 25cm in front of a concave mirror. The focal length of the mirror is 15 cm. At what distance from the mirror should a screen bekept so as to get a clear image? Whatwill be the size and nature of theimage?
Answer» SIZE of object ho=7cmSize of the object ho=?Focal length f=−15cmObject DISTANCE u=−25cmImage distance v=?Using mirror formula, f1=v1+u1−151=v1+−251v1=75−5+3v=−37.5cmHence, POSITION of IMAGE at 37.5cm infront of the mirror.Magnification(M)=hohi=u−v=−2537.5=−1.5hi=−1.5×hOhi=−1.5×7=−10.5cmHence,size of image is −10.5cm.Nature of image is real,inverted and magnified.