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Define the principal focus of a concave ...

Define the principal focus of a concave mirror.

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Light rays that are parallel to the principal axis of a concave mirror converge at a specific point on its principal axis after reflecting from the mirror. This point is known as the principal focus of the concave mirror.
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Define the principal focus of a lens.

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Define principal focus.

Principal focus of concave lens:

NCERT-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. Which one of the following materials cannot be used to make a lens ?

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

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

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

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  19. No matter how far you stand from a spherical mirror, your image appear...

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  20. Which of the following lenses would you prefer to use while reading sm...

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