CBSE Class 12-science Answered
A double convex lens of refractive index 1.6 has its both surfaces of equal radii of curvature of 30cm each.
An object of height 5cm is placed at a distance of 12.5cm from the lens. Calculate the size of the
image formed.
Asked by Sudheer Nair | 28 Feb, 2012, 02:07: PM
Expert Answer
1/f=(1/v)-(1/u)=(µ-1)(1/R1 -1/R2 )
µ=1.6
R1 =30 cm
R2 =-30 cm
1/f = (1.6-1) (1/30 +1/30)
=0.6 (2/30)
=1.2/30
F= 30/1.2= 25 cm
U=12.5 cm
V=?
1/f =1/v -1/u
1/25 =1/v-1/12.5
1/v=1/25 +1/12.5
1/v = 3/25
V= 25/3 =8.33 cm
As (h2/h1)= v/-u
H2/5= 8.33/-12.5
H2 =-3.33 cm
Answered by | 04 Mar, 2012, 03:16: PM
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