An object of size 7cm is placed at 27cm

Asked by admin @ in Chemistry viewed by 344 People

An object of size 7.0 cm is placed at 27 cm in front of a concave mirror of focal

length 18 cm. At what distance from the mirror should a screen be placed, so that
a sharp focussed image can be obtained? Find the size and the nature of the image.
NCERT Class X
Science - Science
Chapter_Light – Reflection and
Refraction

Answered by admin @


Given

 Size of the object [o] = +7cm
  F = -18cm
  U= -27cm

 V = ?

 1/f = 1/v+1/u

 1/-18cm = 1/v-1/27
  1/v= -1/54
v = -54cm

Since Vis – ve screen should be placed at 54cm in front of the mirror.

Size of the image : m= I/O= -v/u
I/7=-[54/27]
I= -14cm

Nature of the image : image is real , inverted and magnified. 







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