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प्रश्न
(a) What type of a lens can be used as a magnifying glass?
(b) Show by a ray diagram the formation of a real image by simple magnifying lens.
उत्तर
(a) A convex lens with short focal length can be used as a magnifying glass.
(b) A simple magnifying glass forma a virtual, erect and magnified image of a tiny object which is distinctly seen by the eye because the eye lens converges the rays to form a real image on the retina.
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संबंधित प्रश्न
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.
If an object is at a considerable distance (or infinity) in front of a convex lens, where is the image formed?
Define principal axis, principal focus and focal length of a convex lens.
Describe with the help of a ray-diagram, the size, nature and position of the image formed by a convex lens when an object is placed beyond 2f in front of the lens.
Find the position and nature of the image of an object 5 cm high and 10 cm in front of a convex lens of focal length 6 cm.
If the object is moved to a point only 3 cm away from the lens, what is the new position, height and nature of the image?
An object is placed 20 cm from (a) a converging lens, and (b) a diverging lens, of focal length 15 cm. Calculate the image position and magnification in each case.
Draw a diagram to represent the second focus of a convex lens.
The focal length of a thin convex lens is ______ than that of a thick convex lens.
Distinguish between Concave lens and Convex lens.
