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प्रश्न
State any two uses of convex lenses.
उत्तर
Two uses of convex lenses are:
(1) They are used in telescopes.
(2) The convex lenses are used in magnifying glasses.They are used in the glasses of those affected with long-sightedness.
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संबंधित प्रश्न
To determine the approximate focal length of the given convex lens by focussing a distant object (say, a sign board), you try to focus the image of the object on a screen. The image you obtain on the screen is always
(a) erect and laterally inverted
(b) erect and diminished
(c) inverted and diminished
(d) virtual, inverted and diminished
Draw a ray diagram to show the formation of the image of an object be placed so that a real and inverted image of the same size as the object is obtained using a convex lens
What is the position of image when an object is placed at a distance of 10 cm from a convex lens of focal length 10 cm?
The focal length of a thin convex lens is ______ than that of a thick convex lens.
A student places a 8.0 cm tall object perpendicular to the principal axis of a convex lens of focal length 20 cm. The distance of the object from the lens is 30 cm. He obtains a sharp image of the object on a screen placed on the other side of the lens. What will be the nature (inverted, erect, magnified, diminished) of the image he obtains on a screen? Draw ray diagram to justify your answer.
For which position of the object does a convex lens form a virtual and erect image? Explain with the help of a ray diagram.
Why do we say that the ‘2F’ and ‘F’ points of a convex lens can be regarded as a sort of ‘turning points’ as far as the nature of the image formed by it is concerned?
: Object near the lens : : ______ : 
Which of the following statements is true?
- In which type of microscope do you find the lens arrangement as shown in the following diagram?
- Write about the working and the use of this microscope.
