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Find the position of an object which whe...

Find the position of an object which when placed in front of a concave mirror of a focal length 20 cm produces a virtual image which is a thrice the size of object.

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Find the position of an object,which when placed in front of a concave mirror of focal length 20 cm,produces a virtual image,which is twice the size of the object.

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At what distance should be placed from a convex lens of focal length 15 cm to obtain an image three times the size of the object?

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MODERN PUBLICATION-REFLECTION AND REFRACTION-EXAMPLE
  1. An object 5 cm high is placed at a distance of 10 cvm from a convex mi...

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

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

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

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

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

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  7. What is the speed of light?

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

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

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

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

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

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

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

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  15. The refractive index of diamond is:

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

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  17. Velocity of light is equal to

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  18. An object of 3 cm height is placed at a distance of 60 cm from a conve...

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  19. An object 5.0 cm of length is placed at a distance of 20 cm in front o...

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  20. Define focal length of a lens

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