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

A concave lens has focal length of `20 cm`. At what distance from the lens a 5 cm tall object be placed so that it forms an image at `15 cm` from the lens? Also, calculate the size of the image formed.

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`v=-0.12m`, Virtual and erect, `7.2`mm tall
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LAKHMIR SINGH & MANJIT KAUR-REFRACTION OF LIGHT-Exercise
  1. A concave lens of 20 cm focal length forms an image 15 cm from the len...

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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  17. Define one dioptre of power of a lens.

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

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  19. Which of the two has a greater power, a lens of short length or a lens...

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  20. How is the power of a lens related to its focal length?

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