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Define power of a lens. What is its unit...

Define power of a lens. What is its unit? One of student uses a lens of focal length 50 cm and another of -50 cm. What is the nature of the lens and its power used by each of them.

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MODERN PUBLICATION-REFLECTION AND REFRACTION-EXAMPLE
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  2. A concave mirror of focal length 20 cm forms a real image at a distanc...

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  3. A convex mirror used on an automobile has a radius of curvature of 3 m...

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  4. An object 1 cm high is place on the axis and 15 cm from a concave mirr...

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  5. The image formed by a concave mirror is half in size of the object. If...

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  6. An object 5 cm high is placed at a distance of 10 cvm from a convex mi...

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  7. When an object is placed at a distance of 60 cm from a convex spherica...

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  8. Find the position of an object which when placed in front of a concave...

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  9. An object is placed 10 cm from a concave mirror of radius of curvature...

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  10. An object is placed 15 cm from a convex mirror of radius of curvature ...

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  11. A 4.5 cm needle is placed 12 cm away from a convex mirror of focal len...

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  12. What is the speed of light?

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  13. If refractive index of glass w.r.t. air is 1.55, then what is the refr...

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  14. The refractive index of water is 4/3 and flint glass is 1.65. What is ...

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  15. A ray of light passes from to air to glass at an angle of incidence of...

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  16. Monochromatic light of wavelength 589 nm is incident from air on a wat...

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  17. The refractive index of diamond is 2.42 and that of glass is 1.5. find...

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  18. A ray of light of frequency of 5 xx 10^(14)Hz is passed through a liqu...

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  19. Velocity of light in a medium is 1.5xx10^8 ms^-1. Find the refractive ...

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  20. The refractive index of diamond is:

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  21. A ray of light passes from air to glass. The glass of incidence is 45^...

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