Advertisements
Advertisements
Question
According to cartesion sign convention, which mirror and which lens has negative focal length?
Advertisements
Solution
Concave mirror is having a negative focal length.
APPEARS IN
RELATED QUESTIONS
With the help of an appropriate ray diagram, state the sign conventions for reflection by a spherical mirror.
Draw a ray diagram to show the path of the refracted ray in each of the following cases:-
A ray of light incident on a concave lens is
(i) passing through its optical centre.
(ii) parallel to its principal axis.
(iii) directed towards its principal focus.
It is desired to obtain an erect image of an object, using concave mirror of focal length of 12 cm.
Where will the image of this object be, if it is placed 24 cm in front of the mirror? Draw ray diagram for this situation also justify your answer. Show the positions of pole, principal focus and the centre of curvature in the above ray diagrams
For what position of an object, a real and diminished image is formed by a concave mirror?
Draw the following diagram in your answer book and show the formation of image with the help of suitable rays:
With the help of a labelled diagram, explain how a concave lens diverges a beam of parallel light rays. Mark the principal axis, optical centre, principal focus and focal length of the concave lens on the diagram.
A convex mirror is used as a shaving mirror.
Draw a ray diagram to show the formation of the image of an object placed beyond the centre of curvature of a concave mirror. State the position, size and nature of the image.
A _____________ mirror is used by a dentist.
The ENT doctor uses a ______.
