Advertisements
Advertisements
प्रश्न
Show by drawing a ray-diagram that the image of an object formed by a concave lens is virtual, erect and diminished.
उत्तर
The image formed by a concave lens is always virtual because it is formed on the left side of the lens. Let us take an object AB beyond the focus (f) as shown in the figure. The image A'B' is formed on the left side of the concave lens and is therefore, virtual. The image is upright. Also the height of A'B' is less than the height of AB. Therefore, the image is diminished.
APPEARS IN
संबंधित प्रश्न
Explain with the help of a diagram, why the concave lens is also called a diverging lens.
Define the principal focus of a concave lens.
A small bulb is placed at the focal point of a converging lens. When the bulb is switched on, the lens produces:
(a) a convergent beam of light
(b) a divergent beam of light
(c) a parallel beam of light
(d) a patch of coloured light
Draw a diagram to show how a converging lens focusses parallel rays of light?
An object is placed 10 cm from a lens of focal length 5 cm. Draw the ray diagrams to show the formation of image if the lens is diverging.
- Name the lens which always forms an erect and virtual image.
- State whether the image in part (a) is magnified or diminished.
A concave lens forms the image of an object which is ______.
A lens forms an image between the object and the lens. Name the lens.
If the power of a lens is -4.0 D, then it means that the lens is a ______.
Distinguish between:
Concave Lens and Convex Lens
