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प्रश्न
What is a virtual image?
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उत्तर
When the rays of light reflecting from an object appear to meet in a virtual form, then the images formed in this way are called virtual images.
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संबंधित प्रश्न
Define the following term in the context of spherical mirrors:- Centre of curvature
Image formed by a convex ______ is always virtual and smaller in size.
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.
Why is a hole burnt in the carbon paper?
Write the formula for a lens connecting image distance (v), object distance (u) and the focal length (f). How does the lens formula differ from the mirror formula?
Name the mirror which always produces an erect and virtual image. How is the size of image related to the size of object?
Why does a driver use a convex mirror instead of a plane mirror as a rear view mirror?
Illustrate your answer with the help of a ray diagram.
State the kind of mirror used
(a) By a dentist,
(b) As a search-light reflector.
Assertion: Incident ray is directed towards the centre of curvature of spherical mirror. After reflection it retraces its path.
Reason: Angle of incidence (i) = Angle of reflection (r) = 0°
