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प्रश्न
Increase in the converging power of eye lens cause ‘hypermetropia'
विकल्प
True
False
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उत्तर
True
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संबंधित प्रश्न
(a) At what distance should the lens be held from the figure in order to view the squares distinctly with the maximum possible magnifying power?
(b) What is the magnification in this case?
(c) Is the magnification equal to the magnifying power in this case? Explain.
What can you see in a completely dark room? If you switch on an electric bulb in this dark room as a light source, explain how you could now see:
(a) the electric bulb
(b) a piece of white paper
Which of the two has a greater power: a lens of short focal length or a lens of large focal length?
What is the unit of power of a lens? Define the unit of power of a lens.
A double convex lens has two surfaces of equal radii R and refractive index \[m = 1 \cdot 5\]
A stick partly immersed in water appears to be bent. Draw a ray diagram to show the bending of the stick when placed in water and viewed obliquely from above.
The power of lens depends on the focal length of the lens
An object is placed in front of a converging lens. Obtain the conditions under which the magnification produced by the lens is
- negative and
- positive.
An object is kept at a distance of 1m from a lens of power +2D:
- Identify the type of lens.
- Calculate its focal length and distance of the image formed.
A lens has a power of \[+2\,D\]. Its focal length is:
