Question

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 be
kept so as to get a clear image? What
will be the size and nature of the
image?​

Answer 1

Answer:

Size of object  ho=7cm

Size of the object  ho=?

Focal length  f=−15cm

Object distance  u=−25cm

Image distance  v=?

Using mirror formula, f1=v1+u1

−151=v1+−251

v1=75−5+3

v=−37.5cm

Hence, position of image at 37.5cm infront of the mirror.

Magnification(M)=hohi=u−v=−2537.5=−1.5

hi=−1.5×hO

hi=−1.5×7=−10.5cm

Hence,size of image is −10.5cm.

Nature of image is real,inverted and magnified.