
How can you find the focal length of a convex mirror?
Important Questions on Light Energy

The radius of curvature of a converging mirror is . At what distance from the mirror should an object be placed so as to obtain a virtual image?

Which of the following statements is not true in reference to the diagram shown above?


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.
Which type of mirror does he have?


An object of height is kept at a distance of from the pole of a diverging mirror. If the focal length of the mirror is , the height of the image formed is ____.



In which of the following is a concave mirror is used?


What should he do to burn the paper?

What will be the angle of incidence when a ray of light passes through the centre of curvature of a concave mirror?





For the diagram shown, according to the new Cartesian sign convention the magnification of the image formed will have the following specifications.

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.


