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If a magnifcation of -1 is to be obtaine...

If a magnifcation of `-1` is to be obtained by using a converging of focal length 12 cm, then the object must be placed.

A

withing 12cm

B

at 24 cm

C

at 6 cm

D

beyond 24 cm

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b)
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LAKHMIR SINGH & MANJIT KAUR-REFRACTION OF LIGHT-Exercise
  1. To obtain a magnification of -2 with a convex lens of focal length 10 ...

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

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

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

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

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

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  7. An object 50 cm tall is placed on the principle axis of a convex lens....

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  8. If the image formed by a lens is always diminished and erect, what is ...

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  9. Copy and complete the diagram below to show what happens to the rays o...

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  10. Which type of lenses are: a) Thinner in the middle than at the edges...

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  11. A ray of light is going towards the focus of a convex lens. Draw a ray...

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  12. a) What type of images can a convex lens make? b) What type of image...

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  13. Take down this figure into your answer book and complete the path of t...

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  14. Fill in the following blanks with suitale words: A) A convex lens ……...

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  15. Things always look small on viewing through a lens. What is the nature...

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  16. An object lies at a distance of 2f from a concave lens of focal length...

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  17. Show by drawing a ray-diagram that the image of an object formed by a ...

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  18. Give the position, size and nature of image formed by a concave lens w...

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  19. Which type of lens is: a) a converging lens, and which is (b) a diverg...

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  20. With the help of a diagram, explain why the image of an object viewed ...

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