Advertisements
Advertisements
प्रश्न
Use the mirror equation to show a convex mirror always produces a virtual image independent of the location of the object ?
Advertisements
उत्तर
A convex mirror
f > 0; u < 0 (always)
Case I |u| > |f|
We know,
`v =(fu)/(u-f)`
`fu <0 and f-u<0`
`=> v>0 ` virtual image
Case `2|u|<|f|`
`v=(fu)/(u-f) fu<0`
`=> u> 0 u-f<0`
Hence, at all the positions convex mirror will form a virtual image.
APPEARS IN
संबंधित प्रश्न
Calculate the distance of an object of height h from a concave mirror of radius of curvature 20 cm, so as to obtain a real image of magnification 2. Find the location of the image also.
Use the mirror equation to show that a convex mirror always produces a virtual image independent of the location of the object.
Using mirror formula, explain why does a convex mirror always produce a virtual image.
An object is kept on the principal axis of a concave mirror of focal length 10 cm. at a distance of 15
cm from its pole. The image formed by the mirror is:
(a) Virtual and magnified
(b) Virtual and diminished
(c) Real and magnified
(d) Real and diminished
The rays of different colours fail to converge at a point after going through a converging lens. This defect is called
Mark the correct options.
A cylindrical vessel of diameter 12 cm contains 800π cm3 of water. A cylindrical glass piece of diameter 8.0 cm and height 8.0 cm is placed in the vessel. If the bottom of the vessel under the glass piece is seen by the paraxial rays (see figure), locate its image. The index of refraction of glass is 1.50 and that of water is 1.33.
A light ray, going through a prism with the angle of prism 60°, is found to deviate by 30°. What limit on the refractive index can be put from these data?
The figure below shows the positions of a point object O, two lenses, a plane mirror and the final image I which coincides with the object. The focal length of the convex lens is 20 cm. Calculate the focal length of the concave lens.
A parallel beam of light is allowed to fall on a transparent spherical globe of diameter 30cm and refractive index 1.5. The distance from the centre of the globe at which the beam of light can converge is ______ mm.
