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Where should an object be placed from a ...

Where should an object be placed from a converging lens of focal length 20 cm, so as to obtain a real image of magnification 2?

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30 cm
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SL ARORA-RAY OPTICS-TYPE H
  1. An object is kept at 0.2m from a convex lens of focal length 0.15 m. F...

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  2. An object of size 3.0 cm is placed 14 cm in front of a concave lens of...

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  3. A needle of height 5 cm placed 45 cm from a lens forms an image on a s...

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  4. Converging light rays are falling on a convex lens. If the focal lengt...

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  5. A beam of light converges to a point P. A lens is placed in the path o...

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  6. A convergent beam of light passes through a diverging lens of focal le...

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  7. The image of a small electric bulb fixed on the wall of a room is to b...

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  8. An illuminated object and a screen are placed 90 cm apart. What is the...

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  9. The image obtained with a convex lens is erect and its length is 4 tim...

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  10. A convex lens is used to throw on a screen 10 m from the lens, a magni...

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  11. Use the thin lens formula to show that an object placed within the foc...

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  12. Use the thin lens formula to deduce algebraically that a concave lens ...

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  13. A screen is placed 90 cm from an object. The image of the object on th...

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  14. Aluminous object and a screen are placed on an optical bench and a con...

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  15. An object and a screen are placed 80 cm apart. There are two positions...

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  16. In Fig. a convex, lens L is placed at a distance of 36 cm from a scree...

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  17. In the following ray diagram are given the position of an object O, im...

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  18. From the ray diagram shown in Fig. calculte the focal length of concav...

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  19. Where should an object be placed from a converging lens of focal lengt...

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