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An object placed 4 cm in front of a conv...

An object placed 4 cm in front of a converging lens produces a real image 12 cm from the lens.
a) What is the magnification of the image?
b) What is the focal length of the lens?
Draw a ray diagram to show the formation of image. Mark clearly F and 2F in the diagram.

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a) 3 b) `+3` cm
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LAKHMIR SINGH & MANJIT KAUR-REFRACTION OF LIGHT-Exercise
  1. Determine how far an object must be placed in front of a converging le...

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  2. A lens of focal length 20 cm is used to produce a ten times magnified ...

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  3. An object placed 4 cm in front of a converging lens produces a real im...

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  4. a) An object 2 cm tall stands on the principal axis of a converging le...

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  5. a) An object 3 cm high is placed 24 cm away from a convex lens of foca...

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  6. a) Find the nature, position and magnification of the images formed by...

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  7. A spherical mirror and a thin spherical lens have each a focal length ...

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  8. Linear magnification proudced by a convex lens can be: a) less than ...

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  9. Magnification produced by a concave lens is always:

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  10. In order to obtain a magnification of, -3(minus 3) with a convex lens,...

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  11. A convex lens produces a magnification of +5. The object is placed:

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  12. If a magnification of, -1(minus 1) is obtained by using a converging l...

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  13. To obtain a magnification of, -0.5 with a convex lens, the object shou...

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  14. An object is 0.09 m from a magnifying lens and the image is formed 36...

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  15. To obtain a magnification of -2 with a convex lens of focal length 10 ...

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  16. A convex lens of focal length 15 cm produces a magnification of +4. Th...

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  17. If a magnifcation of -1 is to be obtained by using a converging of foc...

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  18. In order to obtain a magnification of, -0.75 with a convex lens of foc...

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  19. A magnifying lens has a focal length of 100 mm. An object whose size i...

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  20. A lens forms a real image 3 cm high of an object 1 cm high. If the sep...

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