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प्रश्न
Define the Focal length of a spherical mirror
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उत्तर
The distance between the pole and the focus is called focal length of the mirror. It is measured in meter or cm.
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संबंधित प्रश्न
A simple microscope is used by watch repairers. Give reason.
Explain the following term related to spherical lenses:- principal axis
An image which can be obtained on a screen is called a ______ image.
When a spherical mirror is held towards the sun and its sharp image is formed on a piece of a carbon paper for some time, a hole is burnt in the carbon paper.
What name is given to the distance between spherical mirror and carbon paper?
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 concave lens produces an image 20 cm from the lens of an object placed 30 cm from the lens. The focal length of the lens is:
(a) 50 cm
(b) 40 cm
(c) 60 cm
(d) 30 cm
What do you mean by the term dispersion?
What is a spherical mirror?
If a spherical mirror breaks, what type of mirrors are the individual pieces?
Draw a ray diagram to show the formation of image by a concave mirror for an object placed between its pole and focus. State three characteristics of the image.
State the position of object for which the image formed by a concave mirror is of same size.
At what distance from a concave mirror of focal length 25 cm should an object be placed so that the size of image is equal to the size of the object.
An object forms a virtual image which is 1/8th of the size of the object. If the object is placed at a distance of 40 cm from the convex mirror, calculate:
- the position of the image
- the focal length of the convex mirror.
What do you understand by the term real image?
The diagram below shows the parallel rays incident on a convex mirror. C is the centre of the curvature of the mirror. By drawing the paths of the reflected rays, label the focus F and hence find the focal length of the mirror.
If the focal length of a spherical mirror is 10 cm, what is the value of its radius of curvature?
Name the type of mirror used in the following situation:
Side/rear-view mirror of a vehicle
Support your answer with reason.
The distance from the center of curvature of the mirror to the pole is called the focal length of the mirror.
