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A concave lens of 20 cm focal length for...

A concave lens of 20 cm focal length forms an image 15 cm from the lens. Compute the object distance.

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60 cm on left side of the lens.
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LAKHMIR SINGH & MANJIT KAUR-REFRACTION OF LIGHT-Exercise
  1. A concave lens of focal length 15 cm forms an image 10 cm from the len...

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  2. An object 60 cm from a lens gives a virtual image at distance of 20 cm...

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  3. A concave lens of 20 cm focal length forms an image 15 cm from the len...

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  4. A concave lens has focal length of 15 cm. At what distance should an o...

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  5. A concave lens has focal length of 20 cm. At what distance from the le...

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  6. A concave lens has focal length of 20 cm. At what distance from the le...

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  7. An object is placed 15 cm from (alpha) a converging mirror, and (b) a ...

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  8. A 2.0 cm tall object is placed 40 cm from a diverging lens of focal le...

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  9. a) Find the position and size of the virtual image formed when an obje...

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  10. a) A small object is placed 150 mm away from a diverging lens of focal...

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  11. A concave lens produces an image 20 cm from the lens of an object plac...

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  12. Only one of the following applies to a concave lens. This is:

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  13. The magnification produced by a spherical lens and a spherical mirror ...

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  14. An object is 2m from a lens which forms an erect image one-fourth (exa...

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  15. An image formed on a screen is three times the size of the object. The...

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  16. The lens A has a focal length of 25 cm whereas another lens B has a fo...

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  17. Which causes more bending (or more refraction) of light rays passing t...

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  18. Name the physical quantity whose limit unit is dioptre.

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  19. Define one dioptre of power of a lens.

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  20. Which type of lens has a) a positive power, and b) a negative power?

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