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Concave lens:Negative focal length:: Con...

Concave lens:Negative focal length:: Convex lens:____.

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Complete the analogy: Concave Lens:Myopia: : Convex Lens:_______.

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Convex lens: converging:: Concave lens:___.

CHETANA PUBLICATION-LENSES-Exercise
  1. What is persistance of vision?

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  2. What is principal focus?

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  3. Concave lens:Negative focal length:: Convex lens:.

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  4. For the normal human eye, the distance of distinct vision is

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  5. What do you mean by power of accommodation?

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  6. Why do we have bring a small object near the eyes in order to see it c...

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  7. An object is placed at a distance of 15 cm from a convex lens.If the f...

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  8. An object is placed at a distance of 10cm from a convex lens of focal ...

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  9. An object is kept 60 cm from a lens gives a virtual image 20 cm in fro...

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  10. An object 6 cm tall is placed in front of a convex lens at a distance ...

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  11. An object is placed vertically at a distance of 20 cm from a convex le...

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  12. 5 cm high object is placed at a distance of 25 cm from a converging l...

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  13. The focal length of a convex lens is 20 cm.What is the power?

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  14. Doctor has prescribed a lens having power +1.5D. What will be the foca...

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  15. Calculate the focal length of a corrective lens having power+2.5D.

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  16. Three lenses having power 2, 2.5 and 1.7 D are kept touching in a row....

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  17. Define the following: Centre of curvature (C)

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  18. Define the following: Radii of curvature (R)

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  19. Define the following: Principal axis

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  20. Define the following: Optical centre(O)

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