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प्रश्न
Find the odd one out and give its explanation.
पर्याय
Simple microscope
Compound microscope
Telescope
Prism
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उत्तर
Prism
Explanation-
Prism disperses light while other optical instruments produce magnified images of objects.
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संबंधित प्रश्न
A student places a candle flame at a distance of about 60 cm from a convex lens of focal length 10 cm and focuses the image of the flame on a screen. After that he gradually moves the flame towards the lens and each time focuses the image on the screen.
(a) In which direction-toward or away from the lens, does he move the screen to focus the image?
(b) How does the size of the image change?
(c) How does the intensity of the image change as the flame moves towards the lens?
(d) Approximately for what distance between the flame and the lens, the image formed on the screen is inverted and of the same size?
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.
"A lens can form a magnified erect image as well as magnified inverted image of an object placed in front of it." State the nature of this lens and draw ray diagrams to justify the above statement. Mark the positions of O, F and 2F in the diagram.
Where should an object be placed in front of a convex lens so as to obtain its real, inverted and magnified image?
If an object is at a considerable distance (or infinity) in front of a convex lens, where is the image formed?
An object is placed at a distance equal to 2f in front of a convex lens. Draw a labelled ray diagram to show the formation of image. State two characteristics of the image formed.
How could you find the focal length of a convex lens rapidly but approximately?
What kind of lens can form:
am erect diminished image?
Define the term principal axis of a lens.
A convex lens is placed in water. Its focal length will ______.
The given below figure shows an object OA and its image IB formed by a lens.
A convex lens forms an image of an object equal to the size of the object. Draw a diagram to illustrate it.
State two applications of a convex lens.
For finding the focal length of a convex lens by obtaining the image of a distant object, one should use as the object.
(1) a well lit distant tree
(2) window grill in the class room
(3) any distant tree
(4) a lighted candle kept at the other end of the table.
The image obtained while finding the focal length of convex lens is ....................
Where must a point source of light be placed in front of a convex lens so as to obtain a parallel beam of light?
What happens to the image formed by a convex lens if its lower part is blackened?
A candle is placed between f and 2f a convex lens. Draw a ray diagram showing the position of the image.
Define the terms principal foci and focal lengths as applied to a convex lens, and show them with the help of proper diagrams.
