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An object is immersed in a fluid.In orde...

An object is immersed in a fluid.In order that the object becomes invisible,it should

A

behave as a perfect reflection

B

absorb all light falling on it

C

have refractive index one

D

have refractive index exactly matching with that of the surrounding fluid

Text Solution

Verified by Experts

The correct Answer is:
D
An object is seen when reflected light from object enters have into eyes when refractive index exactly same then no reflection from the object.
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ALLEN-GEOMETRICAL OPTICS-EXERCISE- 01
  1. What is the least radius through which an optical fiber of core diamet...

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  2. A ray of light from a denser medium strikes a rarer medium at an angle...

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  3. An object is immersed in a fluid.In order that the object becomes invi...

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  4. A ray of light is incident upon an air/water interface ( it passes fro...

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  5. A light ray is incident on a transparent sphere of index = sqrt(2) , a...

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  6. An air bubble inside water. The refractive index of water is 4/3 . At ...

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  7. A paraxial beam is incident on a glass (n=1.5) hemisphere of radius R=...

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  8. A concave spherical surface of radius of curvature 10 cm separates two...

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  9. A double convex lens, made of a meterial of refractive index mu(1), is...

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  10. Optic axis of a thin equiconvex lens is the x-axis. The co-rodinates o...

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  11. A converging lens of focal length 20 cm and diameter 5 cm is cut along...

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  12. Look at the ray diagram shown ,what will be th focal length of th e1^(...

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  13. A diverging lens of focal length 10cm is placed 10cm in front of a pla...

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  14. A point object O moves from the principal axis of a converging lens in...

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  15. A point object O is placed at a distance of 20 cm from a convex lens o...

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  16. A point source of light is placed on the principal axis between F and ...

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  17. A man wants to photograph a white donkey as a Zwbra after fitting a gl...

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  18. Alens is placed between a source of light and a wall. It forms images ...

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  19. In the displacement method , a convex lens is placed in between an obj...

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  20. A beam of light consisting of red, green and blue colurs is incident o...

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