Advertisements
Advertisements
प्रश्न
A point light source is kept in front of a convex mirror at a distance of 40 cm. The focal length of the mirror is 40 cm. Find the position of image.
Advertisements
उत्तर
Given,
u = 40 cm (negative)
f = 40 cm (positive)
Mirror formula:
`1/u + 1/v = 1/f`
Substituting the values in the formula above, we get,
`- 1/40 + 1/v = 1/40`
`1/v = 1/40 + 1/40`
`1/v = (1 + 1)/40`
`1/v = 2/40`
`1/v = 1/20`
⇒ v = 20 cm.
The image is behind the mirror at a distance 20 cm.
APPEARS IN
संबंधित प्रश्न
A ray of light is incident normally on a plane mirror. What will be the:
- angle of incidence?
- angle of reflection?
Write the formula for a lens connecting image distance (v), object distance (u) and the focal length (f). How does the lens formula differ from the mirror formula?
Write true or false
A virtual image formed by a spherical mirror is always erect and situated behind the mirror.
Complete the following diagrams in Figure by drawing the reflected rays for the incident rays 1 and 2.
Write two more characteristics of the image.
Draw a ray diagram to show the formation of image of an object kept in front of a convex mirror. State three characteristics of the image.
If the focal length of a spherical mirror is 10 cm, what is the value of its radius of curvature?
Size of image of an object by a mirror having a focal length of 20 cm is observed to be reduced to 1/3rd of its size. At what distance the object has been placed from the mirror? What is the nature of the image and the mirror?
The minimum length of the mirror required to see the full image of the person is half ‘ of his height.
The distance from the center of curvature of the mirror to the pole is called the focal length of the mirror.
