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In displacement method, the lengths of i...

In displacement method, the lengths of images in the two positions of the lens betwent the object and the screen are 9 cm and 4 cm respectively. The length of the object must be

A

6.25 cm

B

1.5 cm

C

6 cm

D

36 cm

Text Solution

Verified by Experts

The correct Answer is:
C
`O=sqrt(I_1I_2)=sqrt(9xx4)=6cm`
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CP SINGH-REFRACTION AT SPHERICAL SURFACES-EXERCISES
  1. In the displacement method, a convex lens is placed in between an obje...

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  2. The distance between the object and the screen is d (greater than 4 ti...

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  3. In displacement method, the lengths of images in the two positions of ...

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  4. The distance between an object and the screen is 100cm. A lens produce...

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  5. A screen is placed a distance 40 cm away from an illuminated object. A...

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  6. In an experiment with a lens the object distance u versus image distan...

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  7. The graph between the object distance along the X-axis and image dista...

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  8. The graps shows the variation of magnification m produced by as conve...

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  9. In an optics experiment, with the position of the object fixed, a stud...

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  10. A student measures the focal length of a convex lens by putting an obj...

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  11. The graph between the lateral magnification (m) produced by a lens and...

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  12. For a convex lens, if real image is formed the graph between (u+v) and...

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  13. Diameter of a plano-convex lens is 6cm and thickness at the centre is ...

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  14. An object is placed at a distance x1 from the principal focus of a len...

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  15. A point object O is placed on the principal axis of a convex lens of f...

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  16. An illuminated object is placed on the principal axis of a converging ...

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  17. A split lens has its two parts separated by a and its focal length is ...

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  18. When a biconvex lens of glass having refractive index 1.47 is dipped i...

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  19. A convex lens if in contact with concave lens. The magnitude of the ra...

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  20. Two plano-concave lenses (1 and 2) of glass of refractive index 1.5 ha...

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