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प्रश्न
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उत्तर
Linear magnification is defined as the ratio of the height of the image to the height of the object. It is taken to be positive for an image to be virtual and erect and negative when image is real and inverted.
Magnification = height of image / height of object.
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संबंधित प्रश्न
Define the following term in the context of spherical mirrors:- Principal axis
Explain the following term related to spherical lenses:- principal focus
Name the two types of spherical mirrors. What type of mirror is represented by the:
- back side of a shining steel spoon?
- front side of a shining steel spoon?
What is the relation between the focal length and radius of curvature of a spherical mirror (concave mirror or convex mirror)?
A lens forms a real image 3 cm high of an object 1 cm high. If the separation of object and image is 15 cm, find the focal length of the lens.
A student obtained a sharp image of a burning candle, placed at the farther end of a laboratory table, on a screen using a concave mirror. For getting better value of focal length of the mirror, the subject teacher suggested him for focusing a well illuminated distant object. What should the student do?
(A) He should move the mirror away from the screen.
(B) He should move the mirror slightly towards the screen.
(C) He should move the mirror as well as the screen towards the newly selected object.
(D) He should move only the screen towards the newly selected object.
Define the terms focus and focal length of a concave mirror. Draw diagram to illustrate your answer.
Name the mirrors shown in Figure (a) and (b).
Choose the correct alternative and rewrite the following:
Mirror used by a dental surgeon is ..........................
