Question

an object of hight 7 cm kept at a distance of 25cm in front of a concave mirror th focal length of the mirror is 15 cm at what distance from the mirror should a screen be kept so as to get a clear image what will be the size and nature of image

Answer 1

for concave lens ......everything is in negative...so v = -5 cm

Answer 2

u=-25cm,height of object = H =7 Cm,f=-15 cm,v=?
1/v-1/u=1/f(mirror formula)
1/v=1/-15+1/-25
     =-1/15-1/25
     = -5-3/75
     =-8/75=-0.10.
magnification,M=-v/u.
                         =-(-8/75)÷25/1
                         =-8/3
THEREFORE THE NATURE OF IMAGE IS REAL AND INVERTED.
SIZE IS  -8/3 TIMES THE ORIGINAL SIZE,THAT IS ,IT IS DIMINISHED..
Hope that helps...
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