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Define the principal focus of a concave ...

Define the principal focus of a concave mirror.

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The principal focus of a concave mirror is a point on its principal axis to which all the light rays which are parallel and close to the axis, converge after reflection from the convace mirror.
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Define the principal focus of a lens.

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Draw the course of a rays for tracing image of an object held between pole and principal focus of a concave mirror. State the position and nature of image formed. or Draw the course of rays for tracing image of an object held between optical centre and principal focus of a convex lens. State the nature of image formed.

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Principal focus of concave lens:

LAKHMIR SINGH & MANJIT KAUR-REFLECTION OF LIGHT -Exercise
  1. An object is placed 15 cm from (alpha) a converging mirror, and (b) a ...

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  2. An object 20 cm from a spherical mirror gives rise to a virtual image ...

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  3. Define the principal focus of a concave mirror.

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

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  5. Name a mirror that can give an erect and enlarged image of an object.

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  6. If the radius of curvature of a spherical mirror is 20 cm, what is its...

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  7. Find the focal length of a concave mirror whose radius of carvature is...

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

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

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  10. Light enters from air into a glass plate having refractive index 1.50....

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  11. Find out from Table on page 225 the medium having highest optical dens...

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

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

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  14. Define one dioptre of power of a lens.

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

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

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

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

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

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

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