Sign convention for the measurement of distances - class-X
Description: sign convention for the measurement of distances | |
Number of Questions: 48 | |
Created by: Chandra Bhatti | |
Tags: ray optics and optical instruments reflection of light light physics light : reflection and refraction at spherical surfaces reflection of light in spherical mirrors light - reflection and refraction optics |
Magnification produced by a convex mirror is $\frac { 1 }{ 3 }$, then distance of the object from mirror is
A convex lens of focal length 30 cm forms an image of height 2 cm for an object situated at infinity. If a concave lens of focal length 20 cm is placed coaxially at a distance of 26 cm in front of convex lens. then size of final image would be:
The object distance $u$ for a concave mirror:
The linear magnification for a mirror is the ratio of the size of the image to the size of the object, and is denoted by m. Then m is equal to (symbols have their usual meanings).
The sum of the reciprocals of object distance and image distance is equal to the __________ of a mirror.
The relation between $u,\,v\;and\;f$ for a mirror is given by
Choose the correct relation between $u,\,v\;and\;r$ for a spherical mirror, where $r$ is radius of curvature.
The unit of magnification is :
The ratio of the size of the image to the size of the object is known as :
An object is placed at a distance of 40 cm in front of a concave mirror of focal length 20 cm. Determine the ratio of the size of the image and the size of object
Linear magnification is
Distances measured below the principal axis are taken as ........
State whether true or false :
A concave mirror forms an erect image of an object placed at a distance of 10 cm from it. The size of the image is double that of the object. Where is the image formed?
A dentist wants a small mirror that when placed $2$cm from a tooth, will produce $3\times$ upright image. What kind of mirror must be used and what must its focal length be?
The focal length of a concave mirror is 50 cm where an object is to be placed so that its image is two times magnified, real and inverted :
A convex mirror has a focal length $f$.A real object is placed at a distance $f$ in front of it from the pole, produces an image at:
The distance between an object its doubly magnified by a concave mirror of focal length $f$ is
An object $2.5\ cm$ high is placed at a distance of $10\ cm$ from a concave mirror of radius of curvature $30\ cm$. The size of the image is:
The focal length $f$ of a mirror is given by $\cfrac{1}{f}=\cfrac{1}{u}+\cfrac{1}{v}$, where $u$ and $v$ represent object and image distances, respectively
A concave lens of focal length $f$ produces an image $(1/x)$ of the size of the object. The distance of the object from the lens is
A concave spherical mirror, forms a 40 cm high real image of an object, whose height is 10 cm. The radius of the mirror is 60 cm. Find the distance from the object to its image.
When a ray of light parallel to the principle axis is incident on a concave mirror$,$ the reflected ray
A mirror faces the negative x-axis. (Normal to its reflecting surface is$- \hat { i } )$ While a particle starts moving such that its image is formed in the mirror. At a certain instant the velocity of the particles is $3 \hat { i } + 4 \hat { j } + 5 \hat { k }$ and that of the mirror is $\hat { 1 } - \hat { j } + \hat { k }$ Choose the correct options.
A thin. rod of length f/ 3 is placed along the principal axis of a concave mirror of focal length f such that its image which is real and elongated, just touches one end of the rod. What is its magnification ?
An astronomical telescope has an objective of focal length $200 \,cm$ and an eye piece of focal length $4\,cm$ The telescope is focused to see an object $10\, km$ from the objective,.The final image is formed at infinity. The length of the tube and angular magnification produced by it is
Let the equation connecting object distance $u$, image distance $v$ and focal length $f$ for a lens be $\dfrac{1}{u} + \dfrac{1}{v} = \dfrac{1}{f}$. A student measures values of $u$ and $v$, with their associated uncertainties.
These are $u = 50\ mm \pm 3\ mm, v = 200\ mm \pm 5\ mm$. He calculates the value of $f$ as $40\ mm$. What is the uncertainty in this value?
A man has a concave shaving mirror of focal length $0.2$ m. How far should the mirror be held from his face in order to give an image of two fold magnification?
A small candle 2.5 cm in size is placed 27 cm in front of a concave mirror of radius of curvature 36 cm.
An object is placed at a distance of 36 cm from a convex mirror . A plane mirror is placed in between , so that the two virtual image so formed coincide . If the plane mirror is at a distance of 24 cm from the object , find the radius of curvature of the convex mirror .
A point object is placed at a distance of $10\mathrm { cm }$ and its real image is formed at a distance of $30\mathrm { cm }$ from a concave mirror. If the object is moved by $0.2\mathrm { cm }$ towards the mirror. the image will shift by about.
For position of real object at $x _1$ and $x _2 (x _2 > x _1)$ magnification is equal to $2$. Find out $\dfrac{x _1}{x _2}$. if focal length of converging lens $f = 20 \,cm$.
A concave mirror produces an image n times the size of an object. If the focal length of the mirrors is '$f$' and image formed is real, then the distance of the object from the mirror is:
Which one of the following has a negative sign, on the basis of new Cartesian sign Convention?
Which of the following statements is correct according to New Cartesian Sign Convention?
A convex lens of focal length 0.12 m produces a virtual n image which is thrice the size of the object. Find the distance between the object and the lens
a) For concave mirror focal length is taken as ........
b) For convex mirror, radius of curvature is taken as ........
A $2.0 cm$ object is placed $15 cm$ in front of a concave mirror of focal length $10 cm$. What is the size and nature of the image?
A $2.0\ cm$ long object is placed perpendicular to the principal axis of a concave mirror. The distance of the object from the mirror is $30\ cm$, and its image is formed $60\ cm$ from the mirror, on the same side of the mirror as the object. Find the height of the image formed :
Magnification m = _____
In a car a rear view mirror having a radius of curvature 1.50 m forms a virtual image of a bus located 10.0 m from the mirror. The factor by which the mirror magnifies the size of the bus is close to
A convex lens is used to form an image of an object on a screen. If the upper half of the lens is blackened so that it becomes opaque, then
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?
From the understanding of cartesian sign convention for reflection by spherical mirror, students took part in group discussion for FA - 1 in classroom. Who is wrong in the group discussion?
Alpesh : All the distances are measured from the pole of a mirror parallel to the principal axis.
Beena : The distances measured in the direction of incident ray are taken positive.
Chamak : The height measured upward and perpendicular to principal axis is taken negative.
Daksha : The height measured downward and perpendicular to principal axis is taken as positive.
Photographs of the ground are taken from an aircraft flying at an altitude of 2000 m by a camera with a lens of focal length 50 cm. The size of the film in the camera is $18 cm\times 18 cm.$ The area of the ground that can be photographed by the camera is:
A thin rod of length $\dfrac {f}{3}$ is placed along the optic axis of a concave mirror of focal length f such that its image which is real and elongated just touches the rod. The magnification is:
The focal length of a convex lens of refractive index $1.5$ is $f$ when it is places in air. When it is immersed in a liquid it behaves as a converging lens its focal length becomes $xf(x>1)$. The refractive index of the liquid
The nature of image of a candle flame located $40$cm from a concave spherical mirror is real, inverted and magnified four times. Then the radius of curvature of the mirror is: