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In a simple microscope, the object is pl...

In a simple microscope, the object is placed within the focal length of the convex lens.

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The focal length of a convex lens is

Draw ray diagram showing the image formation by a convex lens when an object is placed at twice the focal length of the lens.

Write three characteristics of the image formed by a convex lens when the object is placed at a distance greater than twice the focal length of convex lens.

A convex lens and a convex mirror of radius of curvature 20 cm are placed co-axially with the convex mirror placed at a distance of 30 cm from the lens. For a point object at a distance of 25 cm from the lens, the final image due to this combination coincides with the object itself. What is the focal length of convex lens ?

Assertion (A): Convex lens behaves like a simple microscope. Reason (R): For larger magnifying power, the focal length of convex lens should be small.

The same size images are formed by a convex lens when the object is placed at 20cm or at 10cm from the lens. The focal length of convex lens is ____ cm

A convex lens and a convex mirror are separated by a distance of 10 cm such that the reflecting surface of the mirror faces the lens. The image of an object placed in front of the convex. Lens at a distance of 20 cm is found to coincide with the object. If the focal length of the convex lens is 15 cm, determine the focal length of the mierror.

The angular magnification of a simple microscope can be increased by increasing :- 1 focal length of lens 2 size of object 3 aperture of lens 4 power of 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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