Advertisements
Advertisements
प्रश्न
Use the mirror equation to deduce that the virtual image produced by a convex mirror is always diminished in size and is located between the focus and the pole.
Advertisements
उत्तर
For a convex mirror, the focal length (f) is positive.
∴ f > 0
When the object is placed on the left side of the mirror, the object distance (u) is negative,
∴ u < 0
For image distance v, we have the mirror formula:
`1/"v" + 1/"u" = 1/"f"`
`1/"v" = 1/"f" - 1/"u"`
But we have u < 0
∴ `1/"v" > 1/"f"`
v < f
Hence, the image formed is diminished and is located between the focus (f) and the pole.
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.
a) Give two reasons to explain why reflecting telescopes are preferred over refracting type.
Use the mirror equation to deduce that an object placed between the pole and focus of a concave mirror produces a virtual and enlarged image.
Using mirror formula, explain why does a convex mirror always produce a virtual image.
Use the mirror equation to show that an object placed between f and 2f of a concave mirror forms an image beyond 2f.
Define the term 'limit of resolution'?
A point source of light is placed in front of a plane mirror.
following Figure shows two rays A and B being reflected by a mirror and going as A' and B'. The mirror
Mark the correct options.
Which of the following (referred to a spherical mirror) do (does) not depend on whether the rays are paraxial or not?
(a) Pole
(b) Focus
(c) Radius of curvature
(d) Principal axis
A light ray falling at an angle of 45° with the surface of a clean slab of ice of thickness 1.00 m is refracted into it at an angle of 30°. Calculate the time taken by the light rays to cross the slab. Speed of light in vacuum = 3 × 108 m s−1.
A small object is placed at the centre of the bottom of a cylindrical vessel of radius 3 cm and height 4 cm filled completely with water. Consider the ray leaving the vessel through a corner. Suppose this ray and the ray along the axis of the vessel are used to trace the image. Find the apparent depth of the image and the ratio of real depth to the apparent depth under the assumptions taken. Refractive index of water = 1.33.
A light ray is incident at an angle of 45° with the normal to a √2 cm thick plate (μ = 2.0). Find the shift in the path of the light as it emerges out from the plate.
Name the physical principle on which the working of optical fibers is based.
The focal length f is related to the radius of curvature r of the spherical convex mirror by ______.
Car B overtakes car A at a relative speed of 40 ms-1. How fast will the image of car B appear to move in the mirror of focal length 10 cm fitted in car A, when car B is 1.9 m away from car A?
When a clock is viewed in a mirror, the needles exhibit a time which appears to be 8:20. Then the actual time will be:
Two plane mirrors are inclined at an angle of 40°. The possible number of images of an object placed at point P would be?
