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Explain the following term related to spherical lenses:- centres of curvature
An image that cannot be obtained on a screen is called ______.
A small object is placed 150 mm away from a diverging lens of focal length 100 mm.
(i) Copy the figure below and draw rays to show how an image is formed by the lens.
Figure
(ii) Calculate the distance of the image from the lens by using the lens formula.
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.
Name the kind of mirror used to obtain:
A virtual and diminished image
Upto what maximum distance from the pole the image in a convex mirror can be obtained? what will be the location of object then ?
Name the two types of spherical mirrors.
A spherical mirror whose reflecting surface is curved outwards is called ______ mirror.
