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What is the focal length of plain goggle...

What is the focal length of plain goggles ?

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KUMAR PRAKASHAN-THE HUMAN EYE AND THE COLOURFUL WORLD-OBJECTIVE QUESTIONS AND ANSWERS (Answer the following questions in very short as directed (Miscellaneous) )
  1. Why does the Sun appear white at noon ?

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  2. Why is the eye lens not perfectly solid ?

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  3. What is the focal length of plain goggles ?

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  4. What happens when elasticity of the crystalline lens is reduced to zer...

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  5. Which defect of the eye occurs due to distortion of cornea ?

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  6. How the defect of astigmatism can be corrected ?

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  7. What is colour blindness? How can it be cured?

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  8. In hypermetropia, how does the size of eyeball change ?

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  9. What change occurs in the focal length, when our eye lens becomes thic...

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  10. What are rods and cones ?

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  11. What is cataract ?

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  12. What would have been the colour of the sky, had there been no atmosphe...

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  13. Due to which phenomenon is the colour of water in deep sea blue ?

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  14. What is the cause for presbyopia ?

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  15. Give the relationship between wavelength of light and its angle of dev...

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  16. For which colour has the glass larger refractive index – violet or gre...

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  17. Which part of human eye is also known as 'white of the eye' ?

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  18. Why is blind spot so called ?

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  19. Which liquid is filled in the space between the eye lens and the retin...

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  20. What happens to the pupil of the eye when the light is (a) very bright...

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