Question 23

It was observed that when the distance between an object and a lens decreases, the size of the image increases. What is the nature of this lens? If you keep on decreasing the distance between the object and the lens, will you still able to obtain the image on the screen? Explain.

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Solution

If the size of the image increases as the distance between the object and lens decreases, then the nature of the lens is a convex type.

No, if the distance between object and lens is less than the focal length of the lens, then a virtual image is formed which cannot be obtained on a screen.

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Question 21

The distance between an object and a convex lens is changing. It is noticed that the size of the image formed on a screen is decreasing. Is the object moving in a direction towards the lens or away from it?

Q. The distance between an object and a convex lens is changing, and it is noticed that the size of the image formed on a screen is decreasing. Is the object moving in a direction towards the lens or away from it?

Q. A sharp image of a distant object is obtained on a screen by using a convex lens. In order to determine the focal length of the lens, you need to measure the distance between the :
(1) lens and the object
(2) lens and the screen
(3) object and the screen
(4) lens and the screen and also between object and the screen

Q. A convex lens is placed between object and a screen. The size of object is

3 c m

and an image of height

9 c m

is obtained on the screen. When the lens is displaced to a new position, what will be the size of image on the screen?

To find the image-distance for varying object-distances in case of a convex lens, a student obtains on a screen a sharp image of a bright object placed very far from the lens. After that he gradually moves the object towards the lens and each time focuses its image of the screen.

(a) In which direction - towards or away from the lens, does he move the screen to focus the object?

(b) What happens to the size of image - does it increase or decrease?

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Image Formation by Lenses

Standard VII Physics

Question 23 It was observed that when the distance between an object and a lens decreases, the size of the image increases. What is the nature of this lens? If you keep on decreasing the distance between the object and the lens, will you still able to obtain the image on the screen? Explain.

If the size of the image increases as the distance between the object and lens decreases, then the nature of the lens is a convex type. No, if the distance between object and lens is less than the focal length of the lens, then a virtual image is formed which cannot be obtained on a screen.

Question 23

It was observed that when the distance between an object and a lens decreases, the size of the image increases. What is the nature of this lens? If you keep on decreasing the distance between the object and the lens, will you still able to obtain the image on the screen? Explain.

If the size of the image increases as the distance between the object and lens decreases, then the nature of the lens is a convex type.

No, if the distance between object and lens is less than the focal length of the lens, then a virtual image is formed which cannot be obtained on a screen.