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प्रश्न
Define the term Principle focus.
उत्तर
Principal focus of a spherical mirror is a point on the principal axis of the mirror, where all the rays travelling parallel to the principal axis and close to it after reflection from the mirror, converge to or appear to diverge from.
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संबंधित प्रश्न
A student focused the Sun rays using an optical device 'X' on a screen S as shown.
From this it may be concluded that the device 'X' is a (select the correct option)
(A) Convex lens of focal length 10 cm.
(B) Convex lens of radius of curvature 20 cm.
(C) Convex lens of focal length 20 cm.
(D) Concave mirror of focal length 20 cm.
Explain the following term related to spherical lenses:- principal focus
Explain the meaning of the terms focus and focal length in case of a convex mirror, with the help of suitable ray diagram.
Upto what maximum distance from the pole the image in a convex mirror can be obtained? what will be the location of object then ?
An object of length 4 cm is placed in front of a concave mirror at distance 30 cm. The focal length of mirror is 15 cm.
- Where will the image form?
- What will be the length of image?
Select the correct option:
A mirror forms a virtual image (diminished) of an object, whatever be the position of object:
Does the mirror name by your form a real image for all locations? Give a reason for your answer.
Define the term Aperture.
Complete the following diagrams shown in the below figure by drawing the reflected ray for each incident ray.
