Advertisements
Advertisements
प्रश्न
With the help of a diagram, explain why the image of an object viewed through a concave lens appears smaller and closer than the object.
उत्तर
If we place an object anywhere between optical center and infinity, then the refraction occurs as in the below diagram:
It is clear in the above ray diagram that the refracted rays meet a point within the focus. And also, this image virtual,erect and smaller than the object.
Thus, if an object is viewed through a concave lens, its image is appeared smaller and closer than the object.
APPEARS IN
संबंधित प्रश्न
A converging lens is used to produce an image of an object on a screen,object on a screen. What change is needed for the image to be formed nearer to the lens?
(a) increase the focal length of the lens
(b) insert a diverging lens between the lens and the screen
(c) increase the distance of the object from the lens
(d) move the object closer to the lens
If an object is placed 21 cm from a converging lens, the image formed is slightly smaller than the object. If the object is placed 19 cm from the lens, the image formed is slightly larger than object. The approximate focal length of the lens is ______.
Draw a diagram to show how a converging lens focusses parallel rays of light?
A ray of light is going towards the focus of a concave lens. draw a ray diagram to show the path of this ray of light after refraction through the lens.
When a fork is seen through lenses A and B one by one, it appears as shown in the diagrams. What is the nature of (i) lens A, and (ii) lens B? Give reason for your answer.
Out of the two lenses, one concave and the other convex, state which one will show the divergent action on a light beam. Draw diagrams to illustrate your answer.
The following diagram in given below shows an object OA and its virtual image IB formed by a lens.
Give two characteristic of the image formed by a concave lens.
An object is placed at a distance 24 cm in front of a convex lens of focal length 8 cm.
(i) What is the nature of the image so formed?
(ii) Calculate the distance of the image from the lens.
(iii) Calculate the magnification of the image.
A concave lens has a focal length 30 cm. Find the position and magnification (m) of the image for an object placed in front of it at distance 30 cm. State whether the image is real or virtual?
