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प्रश्न
In the figure given below L is a convex lens, M is a plane mirror and S is a point source of light. Rays of light from the source S return to their point of origin. Complete the ray diagram to show this. What is the point S called?
उत्तर
The complete ray diagram is shown below:
The point S is called the focus of the lens.
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संबंधित प्रश्न
(a) Draw a ray diagram to show the formation of image by a concave lens when an object is placed in front of it.
(b) In the above diagram mark the object distance (u) and the image distance (v) with their proper signs (+ve or –ve as per the new Cartesian sign convention) and state how these distances are related to the focal length (f) of the concave lens in the case.
(c) Find the nature and power of a lens which forms a real and inverted image of magnification –1 at a distance of 40 cm from the optical centre.
Where should an object be placed so that a real and inverted image of the same size as the object is obtained using a convex lens?
Where should an object be placed in order to use a convex lens as a magnifying glass?
If an object is at a considerable distance (or infinity) in front of a convex lens, where is the image formed?
Fill in the following blank with suitable word:
The image in a convex lens depends upon the distance of the ........... from the lens.
A convex lens of focal length 10 cm is placed in contact with a concave lens of focal length 20 cm. The focal length of this combination of lenses will be:
(a) +10 cm
(b) +20 cm
(c) −10 cm
(d) −20 cm
What is the difference between a double convex and a bi-convex lens?
State the position of object, position of image, nature of image when: Convex lens is used as objective lens of astronomical telescope.
State the position of object, position of image, nature of image when: Convex lens is used as in searchlight.
Distinguish between Concave lens and Convex Lens.
