The radius of curvature is equal to twice the focal length of concave mirror.
Important Questions on Light
A concave mirror of focal length 15cm forms an image. The position of the object when the image is virtual and linear magnification is 2 is.
What is meant by the pole of a spherical mirror?
What type of mirror is used in the viewfinder of a motor car?
What will be the angle of incidence when a ray of light passes through the centre of curvature of a concave mirror?
What type of mirror is used by dentists? Why does a ray of light not deviate as a result of refraction through a glass slab?
Where in front of a concave mirror image of an extended object placed at infinity will be formed by the mirror? Mention one feature of the image.
Observe the following diagram and answer the question given below
Explain why a ray of light passing through the centre of curvature of a concave mirror gets reflected back along the same path.
A student holding a mirror in his hand, directed the reflecting surface of the mirror towards the Sun. He then directed the reflected light on to a sheet of paper held close to the mirror.
Will he be able to determine the approximate value of focal length of this mirror from this activity ? Give reason and draw ray diagram to justify your answer in this case.
