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When an object is placed at a distance 6...

When an object is placed at a distance 6 cm from a concave lens a virtual image is formed at a distance 4cm from it. Find the focal length of the lens.

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R G PUBLICATION-RAY OPTICS AND OPTICAL INSTRUCMENTS-EXERCISE
  1. What is optical fibres? What principle is used in it?

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  2. Write a short note on optical fibre.

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  3. Deduce the equation for the refraction at a spherical surface seperati...

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  4. Deduce the familiar thin lens formula 1/v-1/u=1/f.

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  5. What is dispersion by a prism. Write with a ray diagram.

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  6. Write a brieft note on formation of a rainbow.

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  7. What is hypermetropia Describe.

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  8. Draw the ray diagram of a simple microscope.

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  9. Write the working of a compound microscope with a ray diagram for the ...

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  10. Write the working principle of a telescope.

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  11. Derive lens maker's formula for a spherical surface.

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  12. For a simple microscope prove that magnification m=1+D//f.

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  13. For a compound microscope prove that magnification is multiplied.

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  14. Describe the working and construction of Galileos telescope.

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  15. What is astigmatism? How it can be removed?

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  16. Deduce the expression for refractive index n of a prism, which is give...

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  17. When an object is placed at a distance 6 cm from a concave lens a virt...

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  18. The angle of minimum deviation produced by a 60 o prism is 40 o ....

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  19. From power prove that for lens. P=P1+P2+P3+.........Pn ​

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  20. How would you combine two lens of focal length 25cm to 2.5 cm to make ...

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