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`        One side of radius of curvature R2=120cm of a convexo-convex lens of material of refractive index n=1.5 and focal ength f1=40 cm is silvered. It is placed on a horizontal surface with the silvered surface in contact with it.Another convex lens of focal length f2=20cm is fixed coaxially d=10cm above 1st lens.A point object on axis give riseto an image coincident with it.Findthe height of the object above the upper lens`
6 years ago

SAGAR SINGH - IIT DELHI
879 Points
```										Dear student,

Let AB represent an object placed at right angles to the principal  axis at a distance greater than the focal length f of the convex lens.  The image A1B1 is formed beyond 2F2 and is real and inverted.
OA = Object distance = u
OA1 = Image distance = v
OF2 = Focal length = f
OAB and OA1B1 are similar

But we know that OC = AB
the above equation can be written as

From equation (1) and (2), we get

Dividing equation (3) throughout by uvf

All the best.
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Sagar Singh
B.Tech, IIT Delhi

```
6 years ago
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