हिंदी

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. - Science

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प्रश्न

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?

अति संक्षिप्त उत्तर
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उत्तर

In the case of a convex lens, as the object moves away from it, the size of the image formed on a screen decreases.

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अध्याय 15: Light - SHORT ANSWER QUESTIONS [पृष्ठ ८३]

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एनसीईआरटी एक्झांप्लर Science [English] Class 7
अध्याय 15 Light
SHORT ANSWER QUESTIONS | Q 21. | पृष्ठ ८३

संबंधित प्रश्न

What kind of mirrors are used in big shopping centres to watch the activities of the customers? 


What would your image look like if you stood close to a large: 

 convex mirror? 


If a driver has one convex and one plane rear-view mirror, how would the images in each mirror appear different? 


A boy is standing in front of and close to a special mirror. He finds the image of his head bigger than normal, the middle part of his body of the same size, and his legs smaller than normal. The special mirror is made up of three types of mirrors in the following order from top downwards:

(a) Convex, Plane, Concave
(b) Plane, Convex, Concave
(c) Concave, Plane, Convex
(d) Convex, Concave, Plane


Two big mirrors A and B are fitted side by side on a wall. A man is standing at such a distance from the wall that he can see the erect image of his face in both the mirrors. When the man starts walking towards the mirrors, he find that the size of his face in mirror A goes on increasing but that in mirror B remains the same.

(a) mirror A is concave and mirror B is convex
(b) mirror A is plane and mirror B is concave
(c) mirror A is concave and mirror B is plane
(d) mirror A is convex and mirror B is concave


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Name two factors on which the focal length of a lens depends. 


A .............. mirror is obtained on silvering the outer surface of a part of a hollow glass sphere.


A full length image of a distant tall building can definitely be seen by using ______.


The image formed by these mirrors is ______ than the object.


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