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प्रश्न
The focal length of a lens is positive. In this case, state the kind of lens.
उत्तर
The positive focal length of a lens indicates that it is a convex lens.
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संबंधित प्रश्न
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?
Define principal axis, principal focus and focal length of a convex lens.
An object is placed at a distance equal to 2f in front of a convex lens. Draw a labelled ray diagram to show the formation of image. State two characteristics of the image formed.
A convex lens of focal length 15 cm produces a magnification of +4. The object is placed:
(a) at a distance of 15 cm
(b) between 15 cm and 30 cm
(c) at less than 15 cm
(d) beyond 30 cm
What kind of lens can form:
an erect magnified image?
A convex lens has a divergent action and a concave lens has a convergent action.
Observe the following figure and complete the table:
| Points | Answer |
| (i) Position of the object | |
| (ii) Position of the image | |
| (iii) Size of the image | |
| (iv) Nature of the image |
State two applications of a convex lens.
Draw a diagram to show the convergent action of a convex lens by treating it as a combination of glass block and two triangular glass prisms, with the aid of two parallel incident rays.
Distinguish between:
Concave lens and Convex lens
