CBSE Class 11-science Answered
solve
Asked by shekhar14351 | 16 Feb, 2010, 09:58: AM
Expert Answer
Dear Student
Say f,u,v are the focal length , object distance and image ddistance respectively.
the first case. u1, v1=30 cm f = uv / (u+v)
==> f=30u1/(30+u1)---(1)
2nd case u2= u1-90 cm, v2=v1+90=120 cm
==> f=(u1-90)120/((u1-90+120)
=(u1-90)120/(u1+30)---(1)
Equate 1,2
==> 30u1=(u1-90)120
==> u1= 4u1-360
==> u1= 120
f=30X120/(30+120)=24 cm
Regards
Team
Topperlearning.com
Answered by | 16 Feb, 2010, 03:23: PM
CBSE 11-science - Physics
Asked by sheikhsaadat24 | 17 Apr, 2024, 09:41: PM
ANSWERED BY EXPERT
CBSE 11-science - Physics
Asked by sy123946 | 07 Apr, 2024, 04:23: PM
ANSWERED BY EXPERT
CBSE 11-science - Physics
Asked by derhebha955 | 03 Apr, 2024, 09:03: AM
ANSWERED BY EXPERT
CBSE 11-science - Physics
Asked by sumedhasingh238 | 29 Mar, 2024, 05:15: PM
ANSWERED BY EXPERT
CBSE 11-science - Physics
Asked by sumedhasingh238 | 28 Mar, 2024, 11:10: PM
ANSWERED BY EXPERT
CBSE 11-science - Physics
Asked by roshnibudhrani88 | 23 Mar, 2024, 05:52: PM
ANSWERED BY EXPERT
CBSE 11-science - Physics
Asked by emad.amd | 21 Mar, 2024, 12:00: PM
ANSWERED BY EXPERT
CBSE 11-science - Physics
Asked by vinitdubey7735 | 14 Mar, 2024, 11:21: AM
ANSWERED BY EXPERT
CBSE 11-science - Physics
Asked by om636694 | 04 Mar, 2024, 09:10: PM
ANSWERED BY EXPERT
CBSE 11-science - Physics
Asked by rajuinwati12 | 04 Mar, 2024, 09:22: AM
ANSWERED BY EXPERT