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What is units of power of lens ?...

What is units of power of lens ?

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What is power of lens ?

f=-100 cm. This is written by an optician. What is the power of lens ?

The near point of a hypermetropic person is 75 cm from the eye. What is the power of the lens required to enable the person to read clearly a book held at 25 cm from the eye ? In what way does the corrective lens help the above person? Does the lens magnify objects held near the eye ?

The far point of a myopic person is 80 cm in front of the eye. What is the power of the lens required to enable his to see very distant objects clearly? b) In what way does the corrective lens help the above person ? Does the lens magnify very distant objects? Explain carefully.

(i) If f = 0.5 m for a glass lens, what is the power of the lens ? (Refractive index of air-water = 1.33. Refractive index for ar - glass = 1.5.)

What is power of lens ?What are its units?

(i) If f = 0.5 m for a glass lens, what is the power of the lens? (ii) The radii of curvature of the faces of a double convex lens are 10 cm and 15 cm. Its focal length is 12 cm. What is the refractive index of glass? (iii) A convex lens has 20 cm focal length in air. What is focal length in water? (Refractive index of air-water = 1.33, refractive index for air-glass = 1.5.)

VGS PUBLICATION-BRILLIANT-HUMAN EYE AND COLOURFUL WORLD-CREATIVE QUESTIONS FOR NEW MODEL EXAMINATION (SECTION-I) (1/2 MARKS QUESTIONS)
  1. In which terms, the degree of convergence or divergence of light ray t...

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

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  3. What is units of power of lens ?

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

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

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

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  7. What is called the angle between the emergent ray and normal of a pris...

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  8. What is called the angle between the incident ray and emergent ray of ...

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  9. Which of the angle of deviation ?

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  10. Which is the angle of the prism ?

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  11. What are anglei(1) and anglei(2) ?

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  12. At angle of minimum deviation, what is the relation between angle of i...

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  13. What is the relation between angle of prism (A), angle of deviation (d...

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  14. Write the formula for the refractive index of the prism.

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  15. Write the formula for the refractive index of the prism.

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  16. A prism with an angle A = 60^(@) produces an angle of minimum deviatio...

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  17. Write one use of a prism .

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  18. Is it splitting of white light into colours explained by using ray the...

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  19. Expand VIBGYOR.

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  20. What is called the splitting of light into different colours ?

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