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प्रश्न
The following diagram shows the object O and the image I formed by a lens. Copy the diagram and on it mark the positions of the lens LL’ and focus (F). Name the lens.
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उत्तर
The complete diagram is shown in the figure in which the position of the lens has been marked by the letter LL’ and the focus as F. The lens is convex (or converging).
संबंधित प्रश्न
Define the power of a lens.
Find the power of a concave lens of focal length 2m.
Give the usual name for the following:
A point inside a lens through which the light passes undeviated.
State the condition for the following a ray passes undeviated through the lens .
A screen is placed a distance 40 cm away from an illuminated object. A converging lens is placed between the source and the screen and its is attempted to form the image of the source on the screen. If no position could be found, the focal length of the lens
A double convex lens has focal length 25 cm. The radius of curvature of one of the surfaces is double of the other. Find the radii, if the refractive index of the material of the lens is 1.5.
Which lens has more power a thick lens or a thin lens?
A point object is placed at O in front of a glass sphere as shown in figure.
Show the formation of the image by the sphere.
The power of convex lens of focal length 20 cm is ______.
The lens of power + 1·0 D is ______.
