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A lens placed at a distance of 20 cm fro...

A lens placed at a distance of 20 cm from an object produces a virtual image `2//3` the size of the object. Find the position of the image, kind of the lens and its focal length.

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PUNJAB BOARD PREVIOUS YEAR PAPERS-Refraction of Light and Lenses-EXERCISE
  1. A lens of focal length 12 cm produces a virtual image. The size of ima...

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  2. The image formed by the lens is erect and its length is three times th...

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  3. A lens placed at a distance of 20 cm from an object produces a virtual...

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  4. A needle placed 40 cm from a lens forms an image on a screen placed 80...

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  5. What is the focal lengthof the combination of a convex lens of focal l...

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  6. An object of size 5 cm is placed at distance of 25 cm in front of a co...

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  7. An object of size 10 cm is placed at distance of 20 cm in front of aco...

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  8. Two lenses of powers+15D and -5D are in contact with each other. What ...

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  9. If the focal length of a converging lens is 50 cm. What is the power o...

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  10. Define refractive index?

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  11. State Snell's law of refraction of light.

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  12. What is refraction of light?

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  13. A convex lens made of a material of refractive index mu1 , is kept in ...

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  14. A convex lens made of a material of refractive index 'mu1' is kept in ...

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  15. A convex lens made of a material of refractive index mu1 is kept ih a...

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  16. Define critical angle for total internal reflection.

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  17. Define critical angle for total internal reflection.

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  18. State Snell's law of refraction of light.

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  19. Name the type of lens whichalways produces virtual and erect image.

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  20. What is total internal reflection, state the necessary conditions for ...

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