A convex lens forms the image of the sun at a distance of `10 cm`. Where will be the image when (i) another lens of same power but dounle the aperture is used ? (ii) another lens of same aperture but double the power is used ?
Text Solution
Verified by Experts
(i) At `10 cm` only, because aperture does not affect `f`. (ii) `5 cm` because when `P` is doubled, `f` is halved.
Topper's Solved these Questions
OPTICS
PRADEEP|Exercise Very short answer question|5 Videos
OPTICS
PRADEEP|Exercise very short answer questions|1 Videos
A convex lens forms a real and inverted image of a needle at a distance of 50 cm from it. Where is the needle placed in front of the convex lens if the image is equal to size of the object ? Also, find the power of the lens.
A convex lens forms a real image of pencil at a distance of 50 cm from the lens . The image formed is of the same size as the object . Find the focal length and power of the lens. At what distance is the pencil placed from the lens ?
A convex lens forms a real and inverted image of a pencil at a distance of 40 cm from the lens. The image formed is of the same size as the object Find the focal length and power of the lens. At what distance is the : object placed from the lens?
A convex lens forms a real and inverted image of a pencial at a distance of 60 cm from the lens. The image formed is of the same size as the object. Find the focal length and power of the lens. At what distance is the pencil placed from the lens. ?
A convex lens forms a real image on a screen placed at a distance 60 cm from the object. When the lens is shifted towards the screen by 20 cm , another image of the object is formed on the screen. The focal length of the lens is :
A convex lens forms an image of a distant obj ect at distance of 20 cm from it. On keeping another lens in contact with the first, if the 40 image is formed at a distance of 40/3 cm from the combination, then the focal length of the second lens is
A convex lens of focal length 10 cm and imag formed by it, is at least distance of distinct vision then the magnifying power is
