Advertisements
Advertisements
Question
What is the relation between focal length and radius of curvature of a concave mirror?
Advertisements
Solution
Focal length of a spherical mirror is equal to half of the radius of curvature of spherical mirror.
Focal length = `"Radius of curvature"/2`
f = `"R"/2`
APPEARS IN
RELATED QUESTIONS
A ray of light is incident on a plane mirror at an angle of 30°. What is the angle of reflection
A 50 cm tall object is at a very large distance from a diverging lens. A virtual, erect and diminished image of the object is formed at a distance of 20 cm in front of the lens. How much is the focal length of the lens?
A small object is placed 150 mm away from a diverging lens of focal length 100 mm.
(i) Copy the figure below and draw rays to show how an image is formed by the lens.
Figure
(ii) Calculate the distance of the image from the lens by using the lens formula.
State the number of images of an object placed between two mirrors, formed in each case when mirrors are inclined to each other at (a) 90°, and (b) 60°.
How is the focal length of a spherical mirror related to its radius of curvature?
When an object of height 1 cm is kept at a distance 4 cm from a concave mirror, its erect image of height 1.5 cm is formed at a distance 6 cm behind the mirror. Find the focal length of mirror, by drawing.
Select the correct option:
A mirror forms a virtual image (diminished) of an object, whatever be the position of object:
The diagram below shows the parallel rays incident on a convex mirror. C is the centre of the curvature of the mirror. By drawing the paths of the reflected rays, label the focus F and hence find the focal length of the mirror.
