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प्रश्न
Answer the following question:
Distinguish between the convex mirror and the concave mirror.
उत्तर
Convex mirror and concave mirror.
| Convex mirror | Concave mirror | |
| 1. | It is called a diverging mirror. | It is called a converging mirror. |
| 2. | The light is reflected from the outer surface. | The light is reflected from the inner surface. |
| 3. | It can form only a virtual image | It can form a real image as well as a virtual image. |
| 4. | According to sign convention, the focal length is positive. | According to sign convention, the focal length is negative. |
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संबंधित प्रश्न
A 4 cm tall object is placed on the principal axis of a convex lens. The distance of the object from the optical centre of the lens is 12 cm and its sharp image is formed at a distance of 24 cm from it on a screen on the other side of the lens. If the object is now moved a little away from the lens, in which way (towards the lens or away from the lens) will he have to move the screen to get a sharp image of the object on it again? How will the magnification of the image be affected?
An image that cannot be obtained on a screen is called ______.
An image which can be obtained on a screen is called a ______ image.
Match the items given in Column I with one or more items of Column II.
| Column I | Column II | ||
| (a) | A plane mirror | (i) | Used as a magnifying glass. |
| (b) | A convex mirror | (ii) | Can form image of objects spread over a large area. |
| (c) | A convex lens | (iii) | Used by dentists to see enlarged image of teeth. |
| (d) | A concave mirror | (iv) | The image is always inverted and magnified. |
| (e) | A concave lens | (v) | The image is erect and of the same size as the object. |
| (vi) | The image is erect and smaller in size than the object. |
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.
A ray of light is incident normally on a plane mirror. What will be the
angle of reflection?
What type of image is formed:
in a plane mirror?
When a spherical mirror is held towards the sun and its sharp image is formed on a piece of a carbon paper for some time, a hole is burnt in the carbon paper.
What is the advantage of using a carbon paper rather than a white paper?
Write the mirror formula. Give the meaning of each symbol which occurs in it.
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:
Which type of spherical mirror will it provide?
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?
A 2.0 cm tall object is placed 40 cm from a diverging lens of focal length 15 cm. Find the position and size of the image.
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?
How is the focal length of a spherical mirror related to its radius
An optical device has been given to a student and he determines its focal length by focusing the image of the sun on a screen placed 24 cm from the device on the same side as the sun. Select the correct statement about the device.
(A) Convex mirror of focal length 12 cm
(B) Convex lens of focal length 24 cm
(C) Concave mirror of focal length 24 cm
(D) Convex lens of focal length 12 cm
A student obtained a sharp image of a burning candle, placed at the farther end of a laboratory table, on a screen using a concave mirror. For getting better value of focal length of the mirror, the subject teacher suggested him for focusing a well illuminated distant object. What should the student do?
(A) He should move the mirror away from the screen.
(B) He should move the mirror slightly towards the screen.
(C) He should move the mirror as well as the screen towards the newly selected object.
(D) He should move only the screen towards the newly selected object.
If a spherical mirror breaks, what type of mirrors are the individual pieces?
What is a spherical mirror?
Name the spherical mirror which (i) diverges (ii) converges the beam of light incident on it. Justify your answer by drawing a ray diagram in each case.
Name the mirrors shown in Figure (a) and (b).
Draw a ray diagram to show the formation of image by a concave mirror for an object placed between its pole and focus. State three characteristics of the image.
Name the kind of mirror used to obtain :
A real and enlarged image
How is the focal length of a spherical mirror related to its radius of curvature?
Upto what maximum distance from the pole the image in a convex mirror can be obtained? what will be the location of object then ?
Answer the following question.
Write the modification in the curvature of the eye lens which enables us to see the nearby objects clearly?
Select the correct option:
A mirror forms a virtual image (diminished) of an object, whatever be the position of object:
Define the following term in relation to concave mirror.
Focal length
Does the mirror name by your form a real image for all locations? Give a reason for your answer.
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.
