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A person suffering from 'presbyopia' (my...

A person suffering from 'presbyopia' (myopia and hyper metropia both defects) should use

A

A concave lens

B

A convex lens

C

A bifocal lens whose lower portion is convex

D

A bifocal lens whose upper portion is convex

Text Solution

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The correct Answer is:
c
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ERRORLESS -RAY OPTICS-SET
  1. A person suffering from 'presbyopia' (myopia and hyper metropia both d...

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  2. In an astronomical telescope in normal adjustment a straight black lin...

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  3. Three lenses L(1) , L(2) , L(3) are placed co-axially as shown in figu...

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  4. An object is placed at a point distant x from the focus of a convex le...

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  5. The diameter of the eye-ball of a normal eye is about 2.5 cm . The pow...

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  6. In a thin spherical fish bowl of radius 10 cm filled with water of ref...

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  7. A small fish 0.4 m below the surface of a lake is viewed through a sim...

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  8. A water drop in air refractes the light ray as

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  9. Which of the following ray diagram show physically possible refraction...

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  10. Following figure shows the multiple reflections of a light ray along a...

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  11. When the rectangular metal tank is filled to the top with an unknown l...

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  12. A concave mirror and a converging lens (glass with mu = 1.5) both have...

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  13. A ray of light strikes a plane mirror M at an angle of 45^(@) as shown...

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  14. A slab of glass, of thickness 6 cm and refractive index 1.5, is placed...

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  15. A point source of light S is placed at the bottom of a vessel containi...

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  16. A point object is placed midway between two plane mirrors a distance a...

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  17. A convergent beam of light is incident on a convex mirror so as to con...

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  18. PQR is a right angled prism with other angles as 60^(@) and 30^(@). Re...

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  19. When a ray is refracted from one medium to another, the wavelength cha...

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  20. Two this lenses, when in contact, produce a combination of power +10 d...

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  21. The plane faces of two identical plano convex lenses, each with focal ...

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