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Define the principal focus of a concave ...

Define the principal focus of a concave mirror.

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**Step-by-Step Solution:** 1. **Understanding the Concave Mirror**: - A concave mirror is a spherical mirror that curves inward, resembling a portion of the interior of a sphere. 2. **Principal Axis**: - The principal axis is an imaginary line that runs perpendicular to the surface of the mirror and passes through its center of curvature and the mirror's vertex. ...
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NCERT ENGLISH-LIGHT - REFLECTION AND REFRACTION-Exercise
  1. Define the principal focus of a concave mirror.

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  2. The radius of curvature of a spherical mirror is 20 cm. What is its fo...

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  3. Name a mirror that can give an errect and enlarged image of an object...

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  4. In motor vehicles, a convex mirror is attached near the driver's seat ...

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  5. (a) What is focal length of a convex mirror of radius of curvature 20 ...

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  6. A concave mirror produces three times magnified real image of an objec...

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  7. A ray of light travelling in air enters obliquely into water. Does the...

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  8. (a) The refractive index of glass is 1.5. What is the speed of light i...

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  9. Find out, from Table 10.3, the medium having highest optical density. ...

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  10. You are given kerosene, turpentine and water. In which of these does t...

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  11. The refractive index of diamond is 2.42. What is the meaning of this s...

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  12. Define one dioptre of power of a lens.

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  13. A convex lens forms a real and inverted image of a needle at a distanc...

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  14. Find the power of a concave lens of focal length 2 m.

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  15. The image formed by a concave mirror is observed to be virtual, erect ...

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  16. Where should an object be placed in front of a convex lens to get a re...

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

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  18. We wish to obtain an erect image of an object, using a concave mirror ...

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  19. Name the type of mirror used in the following situations : (a) Head ...

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  20. One half of a convex lens is covered with a black paper. Will this len...

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