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What is a bifocal lens ?...

What is a bifocal lens ?

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A biofocal lens is a lens of which the upper part of a concave lens to correct myopia and the lower part is a convex lens to correct hypermetropia
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NAVNEET PUBLICATION - MAHARASHTRA BOARD-LENSES-Answer the following questions :
  1. Observe the following figures and complete the table .

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  2. What is presbyopia ? State the reason for this defect . How is presbyo...

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  3. What is a bifocal lens ?

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  4. Anil cannot see the blackboard writing clearly, but he can see nearby ...

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  5. Anil cannot see the blackboard writing clearly, but he can see nearby ...

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  6. Anil’s uncle cannot see nearby objects clearly, but he can see...

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  7. Anil’s uncle cannot see nearby objects clearly, but he can see...

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  8. When are bifocal lenses used in spectacles?

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  9. Aniket from Std. X uses spectacles. The power of the lenses in his ...

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  10. Aniket from Std. X uses spectacles. The power of the lenses in his ...

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  11. Aniket from Std. X uses spectacles. The power of the lenses in his ...

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  12. Sunita from std. X uses spectacles . Her spectacle number is -1.5 D . ...

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  13. Sunita from std. X uses spectacles . Her spectacle number is -1.5 D . ...

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  14. Sunita from std. X uses spectacles . Her spectacle number is -1.5 D . ...

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  15. Surabhi from Std. X uses spectacles. The power of the lenses in her sp...

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  16. Surabhi from Std. X uses spectacles. The power of the lenses in her sp...

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  17. Surabhi from Std. X uses spectacles. The power of the lenses in her sp...

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  18. My grandfather uses a bifocal lens in his spectacles. Explain why.

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  19. State used of a concave lens.

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  20. State used of a convex lens.

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