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प्रश्न
What is a virtual image?
What are virtual images?
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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.
संबंधित प्रश्न
Explain the following term related to spherical lenses:- centres of curvature
Define the Focal length of a spherical mirror
Name the spherical mirror which can produce a real and diminished image of an object.
The shiny outer surface of a hollow sphere of aluminium of radius 50 cm is to be used as a mirror:
Which type of spherical mirror will it provide?
A diverging lens is used in ______.
An optical device has been given to a student and he determines its focal length by focusing the image of the sun on a screen placed 24 cm from the device on the same side as the sun. Select the correct statement about the device.
(A) Convex mirror of focal length 12 cm
(B) Convex lens of focal length 24 cm
(C) Concave mirror of focal length 24 cm
(D) Convex lens of focal length 12 cm
The letters on the front of an ambulance are written laterally inverted like 
. Give reason.
Name the mirror which always produces an erect and virtual image. How is the size of image related to the size of object?
State the position of object for which the image formed by a concave mirror is of same size.
The radius of curvature of a convex mirror is 40 cm. Find its focal length.
Answer the following question.
Write the modification in the curvature of the eye lens which enables us to see the nearby objects clearly?
Define the following term in relation to concave mirror.
Pole
Define the following term in relation to concave mirror.
Center of curvature
Define the term principal focus in case of convex mirror. Draw a convex mirror and show its principal focus and focal length clearly.
Is real image always inverted?
In the following figure shows a concave mirror with its pole (P), focus (F) and centre of curvature (C). Draw a ray diagram to show the formation of the image of an object AB by the concave mirror.
Complete the following diagrams shown in the following figures by drawing the reflected rays.
Numerical problem.
The radius of curvature of a spherical mirror is 25 cm. Find its focal length.
For a spherical mirror, ______ is true.
The image formed in a plane mirror is always inverted.
Define the radius of curvature.
Visit a nearby hospital. You can also visit the clinic of an ENT specialist, or a dentist. Request the doctor to show you the mirrors used for examining ear, nose, throat and teeth. Can you recognise the kind of mirror used in these instruments?
