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When two thin converging lenses of focal...

When two thin converging lenses of focal lengths f, and f, are held in contact with each other, calculate the power of the combination.

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BINA LIBRARY-Optics-I-EXERCISE
  1. Derive the lens formula 1/f=1/v-1/ufor a convex lens.

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  2. What is meant by power of a lens? What is its unit?

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  3. When two thin converging lenses of focal lengths f, and f, are held in...

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  4. What is meant by the angle of minimum deviation of a prism?

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  5. Find a relation between minimum deviation and the refractive index of ...

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  6. Explain why white light is dispersed while passing through a prism.

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  7. What are the two main defects of vision? State how these are rectified...

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  8. With the help of a labelled ray diagram, show the image formation by a...

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  9. Derive an expression for compound microscope's magnifying power.

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  10. Draw a labelled ray diagram of an astronomical telescope for a near po...

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  11. Write down the expression for astronomical magnifying power.

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  12. Draw a labelled ray diagram to show the image formation in an astronom...

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  13. Write down the expression for astronomical magnifying power.

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  14. State two drawbacks of astronomical telescope.

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  15. Draw a labelled ray diagram to show the image formation in a reflectin...

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  16. Write two advantages of a reflecting telescope over a refracting teles...

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  17. Modern telescope prefer using mirrors over using suitable lenses. Give...

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  18. Concave mirrors are used as shaving mirrors. Why?

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  19. Give reasons why convex mirrors are generally used as driving mirrors.

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  20. How will you distinguish between plane, concave and convex mirrors?

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