A convex lens has a focal length of . At what distance from the lens should the object be placed so that it forms a real and inverted image away from the lens? What would be the size of the image formed if the object is high? With the help of a ray diagram show the formation of the image by the lens in this case.
Important Questions on Light - Reflection and Refraction
The refractive indices of four mediaand are given in the following table:
| Medium | ||||
| Refractive Index |
If light travels from one medium to another, in which case the change in speed will be (i) minimum, (ii) maximum.
At what distance should an object be placed from a lens of focal length to obtain its image on a screen placed on the other side at a distance of from the lens? What will be the magnification produced in this case?
What do you mean by optically denser and optically rarer media? How is the speed of light related to optical density?
With the help of neat ray diagrams show the path of reflected ray formed on reflection from a spherical mirror, when
(i) Incident ray passes through (or directed towards) the principal focus of mirror.
With the help of neat ray diagrams show the path of reflected ray formed on reflection from a spherical mirror, when
(ii) Incident ray passes through (or directed towards) the centre of curvature of the mirror.
Draw a ray diagram to show the complete path of the light ray that travels through a rectangular glass slab.
Draw ray diagrams to show the formation of a three times magnified () real image () virtual image of an object kept in front of a converging lens, mark the positions of object, and position of image clearly in the diagram.
A high candle flame is placed at a distance of from a white screen. On placing a convex lens exactly at the midpoint of the candle and the screen, a distinct image of the flame is seen on the screen. What is the focal length of the lens and the size of the candle flame image formed?
