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The principal focurs of a convex lens is...

The principal focurs of a convex lens is virtual.

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The principal focus of a convex lens is real
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The principal focus of a convex lens is virtual . True/False

Principal focus of convex lens:

Principal focus of concave lens:

The rays of light falling on a convex lens in a direction parallel to principal axis of the lens, get refracted through the lens and meet actually at a single point F on the principal axis of the lens. This point is called principal focus of the lens. Read the above passage and answer the following questions : (i) Is principal focus of a convex lens, a real point ? Is the same true for a concave lens ? (ii) A distinct image of a distant tree os obtained on a screen held at 40 cm from a convex lens. What is its focal length ? (iii) Our teachers and parants advise us to stay focussed. What does it imply ?

An object placed at a distance of a 9cm from the first principal focus of a convex lens produces a real image at a distance of 25cm. from its second principal focus. then the focal length of the lens is :

Define the principal focus of a lens.

An object 50 cm tall is placed on the principal axis of a convex lens. Its 20 cm tall image is formed on the screen placed at a distance of 10 cm from the lens. Calculate the focal length of the lens.

NAVNEET PUBLICATION - MAHARASHTRA BOARD-LENSES-True and False
  1. A convex lens is used as a simple microscope . True/False

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  2. A concave lens is used to correct myopia. True/False

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  3. A convex lens is used to correct hypermetropia. True/False

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  4. When red light falls on the eyes , the cells responbing to red light ...

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  5. When an object is placed in front of a concave lens , its image is obt...

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  6. The image formed by a concave lens is always virtual.

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  7. The principal focurs of a convex lens is virtual.

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  8. An object of height 2 cm forms an image of height 3 cm when placed in ...

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  9. Absence of rod like cells results in colour blindness. True/False

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  10. Nearsightedness can be corrected using spectacles having convex lenses...

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  11. Farsightedness can be corrected using spectacles having lenses of suit...

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  12. As one grows old, ciliary muscles become weak. True/false

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  13. In a simple microscope, the object is placed within the focal length o...

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  14. A compound microscope forms an erect and real image of a small object.

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  15. In a compound microscope, a real image acts as an object for the eye...

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  16. In television, we see a continuous picture due to persistence of visio...

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  17. The conical cells can respond differently to red, green and blue colou...

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  18. The rod like cells respond to colours, and communicate the presence of...

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  19. The conical cells respond to the intensity of light and communicate th...

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  20. Generally, using the same objective lens, but different eyepieces, dif...

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