Advertisements
Advertisements
Question
What is the relation between the focal length and radius of curvature of a spherical mirror (concave mirror of convex mirror)? Calculate the focal length of a spherical mirror whose radius of curvature is 25 cm.
Solution
The relation between the focal length and radius of curvature of a spherical mirror is as follows:
Radius of curvature = 2 x focal length
R = 2f
Given, the radius of curvature 'R' = 25 cm
Then, the focal length `f``=25/2 =12.5cm`
APPEARS IN
RELATED QUESTIONS
Explain the following term related to spherical lenses:- principal focus
A virtual image larger than the object can be produced by a ______.
A ray of light is incident on a plane mirror at an angle of 30°. What is the angle of reflection
The diagram below in Figure, shows a convex mirror. C is its centre of curvature and F is its focus. (i) Draw two rays from A and hence locate the position of image of object OA. Label the image IB. (ii) State three characteristics of the image.
For what position of object, the image formed by a concave mirror is magnified and erect?
An object is placed at 4 cm distance in front of a concave mirror of radius of curvature 24 cm. Find the position of image. Is the image magnified?
Draw a ray diagram in each of the following cases to show the formation of image, when the object is placed :
(i) between the optical centre and principal focus of a convex lens.
(ii) anywhere in front of a concave lens.
(iii) at 2F of a convex lens.
State the signs and values of magnifications in the above-mentioned cases (i) and (ii).
Select the correct option:
Which mirror is used in periscope?
Complete the following diagrams shown in the below figure by drawing the reflected ray for each incident ray.
