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Explain why rainbow is never seen on the...

Explain why rainbow is never seen on the surface of the moon.

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BINA LIBRARY-Optics-I-EXERCISE
  1. Does the focal length of a lens change if instead of blue light, monoc...

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  2. A thin converging lens has a focal length 'f in air. If it is complete...

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  3. Explain why rainbow is never seen on the surface of the moon.

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  4. Explain why is the sun visible a little before actual sunrise and a li...

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  5. Explain the origin of the blue colour of sky.

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  6. Explain why the setting sun looks red?

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  7. Why is red light used as a danger signal ?

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  8. Explain why yellow head-lights are used in cars in foggy weather.

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  9. In order to take colour photograph of a planet, what kind of telescope...

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  10. Why should a simple magnifying glass be placed closer to the eye ?

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  11. What is the best position for eye viewing an object through microscope...

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  12. Define beam of light.

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  13. Find the position of an object which when placed in front of a concave...

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  14. When an object is placed at a distance of 60 cm from a convex mirror, ...

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  15. An object is kept at 0.2 m from a convex lens of focal length 0.15 m. ...

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  16. A double convex lens made of glass of refractive index 1.5 has both ra...

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  17. Calculate the focal length of the combination of a convex lens of foca...

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  18. A converging lens has focal length of 20 cm in air. It is made of a ma...

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  19. Two lenses of powers, 15D and +5D are in contact with each other formi...

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  20. The refractive index of a prism of angle 60 degree is 1.62 for sodium ...

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