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प्रश्न
A lens forms an erect, magnified and virtual image of an object.Draw a ray diagram to show the formation of image.
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उत्तर
संबंधित प्रश्न
The speed of light in air is 3 × 108 m s-1. Calculate the speed of light in glass. The refractive index of glass is 1.5
Define magnifying power of a simple microscope. How can it be increased?
Ray diagram for the formation of image by a magnifying glass.
The focal length of a convex lens is 25 cm. At what distance from the optical centre of the lens an object be placed to obtain a virtual image of twice the size?
An illuminated object lies at a distance 1.0 m from a screen. A convex lens is used to form the image of the object on a screen placed at a distance of 75 cm from the lens. Find:
- the focal length of the lens, and
- the magnification.
An object is placed at a distance of 20 cm in front of a concave lens of focal length 20 cm. find: the magnification of image.
The magnification by a lens is -3. Name the lens and state how are u and v related?
Why is the focal length of the lens, used as a magnifying glass, kept short?
Define magnification produced by a lens. State its unit.
What is a simple microscope or a magnifying glass? Draw a ray diagram to show its function.
