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Which portion of a bi-focal lens is (a)...

Which portion of a bi-focal lens is
(a) a concave lens
(b)a convex lens ?

Text Solution

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( a ) Upper portion
(b) Lower portion.
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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. What happens to the pupil of the eye when the light is (a) very bright...

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  2. A man is wearing spectacles of focal length +1 m. What can be the defe...

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  3. Which portion of a bi-focal lens is (a) a concave lens (b)a convex l...

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  4. When sunlight enters into a room filled with dark smoke, its path beco...

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  5. What is the function of the iris ?

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  6. What are light sensitive cells ?

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  7. What type of signals are generated and sent to the brain by light sens...

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  8. What holds the crystalline lens in the human eye?

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  9. Which part of the human eye helps in changing the thickness of the eye...

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  10. What is dispersion of white light ?

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  11. Give the main difference between the lens of the human eye and the len...

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  12. The image formed on the retina is inverted, but we see the object erec...

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  13. The absolute refractive index of a medium is 2.0. The speed of light i...

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  14. Match the column properly:

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  15. Match the following column:

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  16. The far point of a myopic eye is 100 cm. What is the focal length of t...

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  17. The near point of a hypermetropic eye is 75 cm. What is the focal leng...

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  18. The eye lens of human eye is a double convex lens. Agree or Disagree?

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  19. Cone-shaped retinal cells respond to the brightness or intensity of li...

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  20. Which property of vision is used in cinematography ?

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