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प्रश्न
: Object near the lens : : ______ : 
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उत्तर
: Object near the lens : : Object at focus :
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संबंधित प्रश्न
A student is using a convex lens of focal length 18 cm to study the image formation by it for the various positions of the object. He observes that when he places the object at 27 cm, the location of the image is at 54 cm on the other side of the lens. Identify from the following diagram the three rays that are obeying the laws of refraction and may be used to draw the corresponding ray diagram.
(A) 1, 2 and 4
(B) 1, 3 and 5
(C) 2, 4 and 5
(D) 2, 3 and 4
Draw a ray diagram to show the formation of image in the above situation
An object 5 cm is placed at a distance of 20 cm in front of a convex mirror of radius of curvature 30 cm. Find the position, nature and size of the image.
When a ray of light enters from one medium to another having different optical densities it bends. Why does this phenomenon occur?
A beam of light travelling in air is incident of water. Draw a ray-diagram indicating the change in its path in water.
Three convex lenses are available having focal lengths of 4 cm, 40 cm and 4 m respectively. Which one would you choose as a magnifying glass and why?
What kind of lens can form:
an inverted magnified image?
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.
A lens forms an upright and magnified image of an object. Name the lens.
State two applications of a convex lens.
The image obtained while finding the focal length of convex lens is ....................
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 |
Draw neat diagram to show the
Convergent action of a convex lens,
State the position of object, position of image, nature of image when: Convex lens is used in cine projector.
State the position of object, position of image, nature of image when: Convex lens is used as in searchlight.
Which lens can produce a real and inverted image of an object?
An object is placed in front of a convex lens such that the image formed has the same size as that of the object. Draw a ray diagram to illustrate this.
A beam of light is incident through the holes on side A and emerges out of the holes on the other face of the box as show in the figure. Which of the following could be inside the box?
Which of the following statements is true?
Distinguish between:
Concave lens and Convex lens
