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Question
Explain the following term related to spherical lenses:- aperture
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Solution
Aperture:-
The diameter of sphere of part of which a lens is formed is called the aperture.
RELATED QUESTIONS
What is a virtual image?
What kind of mirror is required for obtaining a virtual image of the same size as the object?
Name the kind of mirror used to obtain
(a) a real and enlarged image
(b) a virtual and enlarged image
(c) a real and diminished image, and
(d) a virtual and diminished image.
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.
In each case (a) and (b), draw reflected rays for the given incident rays and mark focus by the symbol F.
The focal length of a concave mirror is 10 cm. Find its radius of curvature.
A point light source is kept in front of a convex mirror at a distance of 40 cm. The focal length of the mirror is 40 cm. Find the position of image.
A straight stick partly dipped in water obliquely appears to be bent at the surface of the water.
Choose the correct alternative and rewrite the following:
Mirror used by a dental surgeon is ..........................
