Advertisements
Advertisements
प्रश्न
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 |
Advertisements
उत्तर
| Points | Answer |
| (i) Position of the object | between F1 and optical center |
| (ii) Position of the image | same side to the object (between 2F1 and F1) |
| (iii) Size of the image | Magnified |
| (iv) Nature of the image | Virtual and erect |
APPEARS IN
संबंधित प्रश्न
An object is placed at a distance of 15 cm from a convex lens of focal length 20 cm. List four characteristics (nature, position, etc.) of the image formed by the lens.
When a ray of light enters from one medium to another having different optical densities it bends. Why does this phenomenon occur?
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?
Complete the following table:
| Instrument | Number of Convex Lenses |
Use |
| Simple Microscope | .............. | .............. |
| Compound Microscope | .............. | .............. |
| Telescope | .............. | .............. |
A beam of light travelling in a rectangular glass slab emerges into air. Draw a ray-diagram indicating the change in its path.
Draw a labelled ray diagram to show how a ray of light is refracted when it passes:
from air into an optically denser medium.
Explain with the help of a diagram, why the convex lens is also called a converging lens.
State whether the convex lens has a real focus or a virtual focus.
If the object is moved to a point only 3 cm away from the lens, what is the new position, height and nature of the image?
Which of the above two cases illustrates the working of a magnifying glass?
Which type of lenses are:
thicker in the middle than at the edges?
A light ray does not bend at the boundary in passing from one medium to the other medium if the angle of incident is:
The given below figure shows an object OA and its image IB formed by a lens
. 
draw suitable rays to locate the lens and its focus.
The image obtained while finding the focal length of convex lens is ....................
How will you decide whether a given piece of glass is a concave lens, convex lens, or a plane glass plate?
Draw a ray diagram to illustrate the determination of the focal length of a convex lens using an auxiliary plane mirror.
How will you determine the focal length of a convex lens by the plane mirror method?
: Object near the lens : : ______ : 
Write scientific reason.
Adults need bifocal lens spectacle.
