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प्रश्न
What is a virtual image?
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
Name the spherical mirror which has:
(a) virtual principal focus.
(b) real principal focus.
What is the relation between the focal length and radius of curvature of a spherical mirror (concave mirror of convex mirror)? Calculate the focal length of a spherical mirror whose radius of curvature is 25 cm.
What do you understand by the focus and focal length of a spherical mirror? Show them on the separate diagrams for each of a concave mirror and a convex mirror.
A student obtained on a screen the sharp image of a candle flame placed at the farther end of laboratory table using a concave mirror. For getting better value of focal length of the mirror, the teacher suggested to him to focus the sun. What should the student do?
(A) Should move the mirror away from the screen.
(B) Should move the mirror towards the screen.
(C) Should move the mirror and screen both towards the sun.
(D) Should move only the screen towards the sun.
Complete the following diagrams shown in Fig. by drawing the reflected ray for each of the incident ray A and B.
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.
Select the correct option:
Looking into a mirror one finds her image diminished, the mirror is:
The spherical mirror with a reflecting surface curved inward is called
Define focal length.
