12) Two students A and B observed the image of a candle flame using a spherical lens of focal length
10cm. Student A observed an inverted magnified image on a screen placed 25cm on the other side
of the lens and student B observed an inverted image of the same size on the screen. What should
be their corresponding object distances? Draw ray diagram to show the image formation by
student A or B.
Answers
Answered by
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Student A:
f=10cms
v=25cm
object distance=?
by lens formula
1/f =1/V- 1/u
1/u = 1/v-1/f
=1/25 -1/10
=2-5/50
=-3/50
u=-50/3
=-16.6cms
student B:
f=10cms
v=20cms
object distance=?
by lens formula
1/f=1/v-1/u
1/u =1/v-1/f
=1/20-1/10
1/u=1-2/20
=-1/20
u= -20cms
object is placed on C and image is formed On C.
refer attachment for ray diagram
f=10cms
v=25cm
object distance=?
by lens formula
1/f =1/V- 1/u
1/u = 1/v-1/f
=1/25 -1/10
=2-5/50
=-3/50
u=-50/3
=-16.6cms
student B:
f=10cms
v=20cms
object distance=?
by lens formula
1/f=1/v-1/u
1/u =1/v-1/f
=1/20-1/10
1/u=1-2/20
=-1/20
u= -20cms
object is placed on C and image is formed On C.
refer attachment for ray diagram
Attachments:
prmkulk1978:
image is placed on C. same size they said. so R =2f
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