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प्रश्न
State the position of object, position of image, nature of image when: Convex lens is used as in searchlight.
उत्तर
Object is at F1. Image is formed at infinity. Image is real; inverted and highly enlarged.
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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.
What is a lens?
Name one simple optical instrument in which the above arrangement of convex lens is used.
A convex lens produces an inverted image magnified three times of an object placed at a distance of 15 cm from it. Calculate focal length of the lens.
What type of lens is used to correct
hypermetropia
Define the term principal axis of a lens.
The image obtained while finding the focal length of convex lens is ....................
State the position of object, position of image, nature of image when: Convex lens is used as an erecting lens in terrestrial telescope.
: Object near the lens : : ______ : 
