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f= -D. What does negative sign indicat...

`f= -D`.
What does negative sign indicate in the above formula ?

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VGS PUBLICATION-BRILLIANT-HUMAN EYE AND COLOURFUL WORLD-CREATIVE QUESTIONS FOR NEW MODEL EXAMINATION (SECTION-I) (1/2 MARKS QUESTIONS)
  1. Which lens can bring the image of the object kept beyond far point, be...

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  2. Write a formula to find focal length of a bi-concave lens, if distance...

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  3. f= -D. What does negative sign indicate in the above formula ?

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  4. For an object at infinite distance, what do you substitute for 'u' in ...

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  5. Which defect of vision does occur, when the eye has a minimum focal le...

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  6. Which vision defect is called as "far sightedness" ?

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  7. Name the vision defect found in the figure.

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  8. What is represented by 'H', given in the above figure ?

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  9. Which lens is used to rectify the vision defect, hypermetropia ?

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  10. What is the focal length of bi-convex lens to use to correct a hyperme...

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  11. What is the vision defect, when the ability of accommodation of the ey...

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  12. Presbyobia means

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  13. A person is suffering from presbyopia which type of lens is prefarable...

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  14. Ramesh used spectacles for presbyopia. His spectacles consists of

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  15. In which terms, the degree of convergence or divergence of light ray t...

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  16. If the focal length of a lens fis in cm, then write the formula of pow...

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  17. What is units of power of lens ?

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  18. Doctors advised to use 2D lens. What is its focal length ?

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  19. A lens has focal length of 50 cm. What is its power ?

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  20. How many triangular bases is there for a glass prism ?

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