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An object is placed at a distance of 30 cm from a concave mirror and its real image is formed at a distance of 30 cm from the mirror. The focal length of the mirror is

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Concave `(100)/(3) ` cm
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AAKASH SERIES-RAY OPTICS-PROBLEMS ( LEVEL-I)
  1. Find the position and nature of the image of an object of height 3 cm ...

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  2. Find the position and nature of the image of an object of height 3 cm ...

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  3. An object is placed at a distance of 30 cm from a concave mirror and i...

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  4. An object 2 cm high is placed at right angles to the principal axis of...

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  5. The sun subtends an angle half a degree at the pole of a concave mirro...

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  6. An object 2 cm high is placed at right angles to the principal axis of...

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  7. A person looks at himself in a silvered ball of diameter 64 cm from a ...

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  8. A convex mirror of radius of curvature 4 m is used as rear -view mirro...

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  9. If the refractive index of diamond is 2.4 find the velocity of light i...

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  10. The wavelength of blue light in air is 4500 Å . What is its frequency?...

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  11. A beam of light is incident on a glass slab of refractive index 1.5 at...

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  12. Find the time taken by light to travel a distance of 3 cm in glass. (c...

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  13. A glass slab of thickness 4 cm contains the same number of waves as 5 ...

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  14. The refractive index of denser medium with respect to rarer medium is ...

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  15. A source of yellow light placed in air is observed by a person swimmin...

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  16. In the arrangement shown in the figure a light ray is incident at an a...

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  17. One side of a glass slab is silvered as shown in the figure. A ray of ...

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  18. Calculate the refractive index of material with respect to air if its ...

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  19. The velocities of light in two different media are 2*10^8m/s and 2.5 *...

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  20. An optical fibre (RI = 1.72) is surrounded by a glass coating (RI= 1.5...

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