Advertisements
Advertisements
प्रश्न
At what distance from a concave mirror of focal length 25 cm should an object be placed so that the size of image is equal to the size of the object.
Advertisements
उत्तर
If an object is placed at the centre of curvature of a concave mirror, the size of the image is equal to the size of the object.
Given,
focal length = 25 cm
As, center of curvature = 2 × focal length
Therefore,
center of curvature
= 2 × 25
= 50 cm
Hence, the object should be placed at 50 cm.
APPEARS IN
संबंधित प्रश्न
A ray of light strikes a plane mirror at an angle of 40° to the mirror surface. What will be the angle of reflection?
When a spherical mirror is held towards the sun and its sharp image is formed on a piece of a carbon paper for some time, a hole is burnt in the carbon paper.
What name is given to the distance between spherical mirror and carbon paper?
Define the terms focus and focal length of a concave mirror. Draw diagram to illustrate your answer.
Figure shows a concave mirror with its pole at P, focus F and centre of curvature C. Draw ray diagram to show the formation of image of an object OA.
An object 5 cm high is placed at a distance 60 cm in front of a concave mirror of focal length 10 cm. Find the position and size of the image.
Draw a ray diagram to show the formation of the image, when the object is placed between optical centre and principal focus of a convex lens.
State the signs and values of magnifications in the above mentioned case.
Define the following term in relation to concave mirror.
Radius of curvature
AB is the object, A'B' is the image, and MM' is the position of the mirror. Complete the ray diagram showing the formation of the image and find the focal length of the mirror.
The radius of curvature of a spherical mirror is 18 cm. What is the focal length of this mirror?
