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प्रश्न
Convex magnifying glass is called divergent magnifying glass and concave magnifying glass is called converging magnifying glass.
विकल्प
Right
Wrong
उत्तर
Convex magnifying glass is called divergent magnifying glass and concave magnifying glass is called converging magnifying glass- Wrong
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संबंधित प्रश्न
Where must the object be placed for the image formed by a converging lens to be:
real, inverted and same size as the object?
A small bulb is placed at the focal point of a converging lens. When the bulb is switched on, the lens produces:
(a) a convergent beam of light
(b) a divergent beam of light
(c) a parallel beam of light
(d) a patch of coloured light
A ray of light is going towards the focus of a concave lens. draw a ray diagram to show the path of this ray of light after refraction through the lens.
Fill in the following blank with suitable word:
Lenses refract light to form images: a..................... lens can form both real and virtual images, but a diverging lens forms only ...................... images.
When an object is placed 10 cm in front of lens A, the image is real, inverted, magnified and formed at a great distance. When the same object is placed 10 cm in front of lens B, the image formed is real, inverted and same size as the object.
What is the focal length of lens B?
An object 60 cm from a lens gives a virtual image at a distance of 20 cm in front of the lens. What is the focal length of the lens? Is the lens converging or diverging? Give reasons for your answer.
Calculate the image distance for an object of height 12 mm at a distance of 0.20 m from a concave lens of focal length 0.30 m, and state the nature and size of the image.
What type of lens is used to correct
myopia?
What kind of lens is used to correct
short-sightedness
Complete the following sentence:
A short-sighted person cannot see ............ objects clearly. Short-sightedness can be corrected by using ........... lenses.
Where will the image be formed if an object is kept in front of a concave lens at a distance equal to its focal length? Draw a ray diagram to illustrate your answer.
Give two characteristic of the image formed by a concave lens.
The power of a lens is negative. State whether it is convex or concave.
Explain the working of an astronomical telescope using refraction of light.
An object is placed at a distance 24 cm in front of a convex lens of focal length 8 cm.
(i) What is the nature of the image so formed?
(ii) Calculate the distance of the image from the lens.
(iii) Calculate the magnification of the image.
A lens forms an image between the object and the lens. Name the lens.
When an object is kept within the focus of a concave mirror, an enlarged image is formed behind the mirror. This image is :
State three characteristics of the image of an extended source, formed by a concave lens.
Convex lens : converging : : concave lens : _______
