Explain the Following Term Related to Spherical Lenses:- Centres of Curvature - Science

Advertisements
Advertisements

Explain the following term related to spherical lenses:- centres of curvature

Advertisements

Solution

Centre of Curvature:-

The centre of sphere of part of which a lens is formed is called the centre of curvature of the lens. Since concave and convex lenses are formed by the combination of two parts of spheres, therefore they have two centres of curvature. One centre of curvature is usually denoted by C1 and second is denoted by C2.

  Is there an error in this question or solution?
2013-2014 (March) All India Set 3

Video TutorialsVIEW ALL [1]

RELATED QUESTIONS

A simple microscope is used by watch repairers. Give reason.


A student obtains a sharp image of the distant window (W) of the school laboratory on the screen (S) using the given concave mirror (M) to determine its focal length. Which of the following distances should he measure to get the focal length of the mirror?


A student focused the Sun rays using an optical device 'X' on a screen S as shown.

From this it may be concluded that the device 'X' is a (select the correct option)

(A) Convex lens of focal length 10 cm.

(B) Convex lens of radius of curvature 20 cm.

(C) Convex lens of focal length 20 cm.

(D) Concave mirror of focal length 20 cm.


Explain the following term related to spherical lenses:- principal axis


Explain the following term related to spherical lenses: focal length


Fill in the blanks:

An image that cannot be obtained on a screen is called ________


Fill in the blanks:

Image formed by a convex ________ is always virtual and smaller in size.


Fill in the blanks:

An image formed by a ________ mirror is always of the same size as that of the object.


Fill in the blanks:

An image which can be obtained on a screen is called a _______image.


Mark ‘T’ if the statement is true and ‘F’ if it is false:

We can obtain an enlarged and erect image by a convex mirror. (T/F)


Mark ‘T’ if the statement is true and ‘F’ if it is false:

A concave mirror always forms a real image. (T/F)


Find out the letters of English alphabet or any other language known to you in which the image formed in a plane mirror appears exactly like the letter itself. Discuss your findings.


What is a virtual image? Give one situation where a virtual image is formed.


Give one use each of a concave and a convex mirror.


A virtual image larger than the object can be produced by a


Define Radius of curvature of the spherical mirror


Define the Focal length of a spherical mirror


A ray of light strikes a plane mirror at an angle of 40° to the mirror surface. What will be the angle of reflection?


A ray of light is incident normally on a plane mirror. What will be the 

 angle of reflection?


Name the spherical mirror which can produce a real and diminished image of an object.


The shiny outer surface of a hollow sphere of aluminium of radius 50 cm is to be used as a mirror: 

 What will be the focal length of this mirror?


Write true or false 

A virtual image formed by a spherical mirror is always erect and situated behind the mirror.


A ray of light travels from a denser medium to a rarer medium. How will it bend?


State the two kinds of spherical mirror and distinguish them with the aid of proper diagrams.


What do you understand by the focus and focal length of a spherical mirror? Show them on the separate diagrams for each of a concave mirror and a convex mirror.


How is a spherical mirror used to diverge a beam of light from a point? Name the type of mirror used.


State the direction of incident ray which after reflection from a spherical mirror gets reflected along its own path. Give a reason.


How is the focal length of a spherical mirror related to its radius


Name the kind of mirror used to obtain
(a) a real and enlarged image
(b) a virtual and enlarged image
(c) a real and diminished image, and
(d) a virtual and diminished image.


Define the following terms in the context of spherical mirrors :
(i) Pole

(ii) Centre of curvature

(iii) Radius of curvature

(iv) Principal axis


If a spherical mirror breaks, what type of mirrors are the individual pieces?


Three mirrors are created from a single sphere. Which of the following - pole, centre of curvature, radius of curvature, principal axis - will be common to them and which will not be common? 


What type of mirror can be used to obtain a real image of an object?


Name the kind of mirror used to obtain :

A real and enlarged image


State two uses of a concave mirror. 


An object of height 2 cm is placed at a distance of 20 cm in front of a concave mirror of a focal length of 12 cm. Find the position, size, and nature of the image.


A straight stick partly dipped in water obliquely, appears to be bent at the surface of water.


The sun is seen before the sunrise and after the sunset.


Choose the correct alternative and rewrite the following:

Mirror used by a dental surgeon is ..........................


Answer the following question:
Distinguish between the convex mirror and the concave mirror.


What kind of mirror is used in vehicles to see the traffic following it?

What is the focal length of a plane mirror?

What is the nature of the mirror having a focal length of -20 cm?

State three characteristics of the image formed by a convex mirror.

How can you distinguish between a convex mirror and a concave mirror? Explain.

Complete the following diagrams shown in the below figure by drawing the reflected ray for each incident ray.


Complete the following diagrams shown in the following figures by drawing the reflected rays.


The spherical mirror with a reflecting surface curved inward is called


The spherical mirror used as a rear view mirror in the vehicle is


The distance from the pole to the focus is called


If the focal length of a spherical mirror is 10 cm, what is the value of its radius of curvature?


The spherical mirror used in a beauty parlour as make-up mirror is _______.


Geometric centre of the spherical mirror is ______.


Define focal length.


Numerical problem.

The radius of curvature of a spherical mirror is 25 cm. Find its focal length.


Name the type of mirror used in the following situation:

Side/rear-view mirror of a vehicle

Support your answer with reason.


The radius of curvature of a spherical mirror is 18 cm. What is the focal length of this mirror?


What is the difference between virtual images of an object formed by a concave mirror and a convex mirror?


A ray of light is incident towards a plane mirror at an angle of 30° with the mirror surface. What will be the angle of reflection?


For a spherical mirror, ______ is true.


A spherical mirror whose reflecting surface is curved outwards is called ______ mirror.


The image formed in a plane mirror is always inverted.


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.


Explain why a ray of light passing through the center of curvature of a concave mirror, gets reflected along with the same pattern.


How tall does a mirror have to be to fit an entire person’s body?


Define the radius of curvature.


What is “aperture”?


In the figure shown, the image of a real object is formed at the point I. AB is the principal axis of the mirror. The mirror must be:


A converging lens of focal length f is placed at a distance 0.3 m from an object to produce an image on a screen 0.9 m from the lens. With the object and the screen in the same positions, an image of the object could also be produced on the screen by placing a converging lens of focal length.


In normal adjustment, for a refracting telescope, the distance between objective and eye piece is 30 cm. The focal length of the objective, when the angular magnification of the telescope is 2, will be ______.


Share
Notifications



      Forgot password?
Use app×