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Explain the following term related to spherical lenses:- optical centre
What type of image is formed:
- in a plane mirror?
- on a cinema screen?
Which are the two convenient rays that are chosen to construct the image by a spherical mirror for a given object? Explain with the help of suitable ray diagrams.
Name the kind of mirror used to obtain :
A real and enlarged image
Name the kind of mirror used to obtain:
A real and diminished image.
A straight stick partly dipped in water obliquely appears to be bent at the surface of the water.
The boxes in figure (a, b, c) represent mirrors; insert a mirror which will reflect the incident ray as shown in the diagram.
Numerical problem.
The radius of curvature of a spherical mirror is 25 cm. Find its focal length.
If the real image of a candle flame formed by a lens is three times the size of the flame and the distance between lens and image is 80 cm, at what distance should the candle be placed from the lens?
The distance from the center of curvature of the mirror to the pole is called the focal length of the mirror.
