Question 11 Mark
Draw a labelled ray diagram to show the formation of image in a convex mirror when the object is at infinity. Mark clearly the pole and focus of the mirror in the diagram.
Answer
View full question & answer→Coming soon
Questions · Page 1 of 2
[1 Mark Questions]
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Test yourself on this topic
50 questions · timed · auto-graded
Question 21 Mark
The image seen in a plane mirror cannot be formed on a screen. What name is given to this type of image?
Answer
View full question & answer→Virtual image.
Question 31 Mark
What sign (+ve or -ve) has been given to the following on the basis of Cartesian Sign Convention?
- Height of a real image.
- Height of a virtual image.
Answer
View full question & answer→- Negative.
- Positive.
Question 41 Mark
What kind of mirrors are used in big shopping centres to watch the activities of the customers?
Answer
View full question & answer→Convex mirrors.
Question 51 Mark
State one use of concave mirror based on the formation of image as in case (z) above.
Answer
View full question & answer→one use of concave mirror based on the formation of image as in case (i) above: As a shaving mirror.
Question 61 Mark
Define:principal axis.
Answer
View full question & answer→Principal axis: The straight line passing through the centre of curvature and pole of a spherical mirror is called its principal axis.
Question 71 Mark
What type of image/ images are formed by:
- A convex mirror?
- A concave mirror?
Answer
View full question & answer→- Virtual and erect.
- Virtual and erect; real and inverted.
Question 81 Mark
If you want to see an enlarged image of your face, state whether you will use a concave mirror or a convex mirror?
Answer
View full question & answer→Concave mirror.
Question 91 Mark
Which type of mirror has:
- Positive focal length?
- Negative focal length?
Answer
View full question & answer→- Convex mirror.
- Concave mirror.
Question 101 Mark
According to the “New Cartesian Sign Convention” for mirrors, what sign has been given to the focal length of:
- A concave mirror?
- A convex mirror ?
Answer
View full question & answer→- Negative.
- Positive.
Question 111 Mark
Which one of these circumstances enables a concave mirror to be used as a shaving mirror?
Answer
View full question & answer→A concave mirror can be used as a shaving mirror when the object is placed between the pole and focus of a concav mirror.
Question 121 Mark
For what position of an object, a real and diminished image is formed by a concave mirror?
Answer
View full question & answer→Beyond the centre of curvature.
Question 131 Mark
What kind of mirror can have a focal length of, – 20cm?
Answer
View full question & answer→Concave mirror (since focal length is negative).
Question 141 Mark
State three characteristics of the image formed in this case.
Answer
View full question & answer→Coming soon
Question 151 Mark
An object is placed at a long distance in front of a convex mirror of radius of curvature 30cm. State the position of its image.
Answer
View full question & answer→Image is formed at the focus.$\text{focus}=\frac{30}{2}=15\text{cm}$
Exmpale: 15cm behind the convex mirror.
Exmpale: 15cm behind the convex mirror.
Question 161 Mark
What type of image is formed:
- In a plane mirror?
- On a cinema screen?
Answer
View full question & answer→- Virtual image.
- Real image.
Question 171 Mark
What is the ratio of the height of an image to the height of an object known as?
Answer
View full question & answer→The ratio of the height of an image to the height of an object known as magnifincation.
Question 181 Mark
Name the mirror which can give:
- An erect and enlarged image of an object.
- An erect and diminished image of an object.
Answer
View full question & answer→- Concave mirror.
- Convex mirror.
Question 191 Mark
Name the spherical mirror which can produce a real and diminished image of an object.
Answer
View full question & answer→Concave mirror.
Question 201 Mark
A ray of light going towards the focus of a convex mirror becomes parallel to the principal axis after reflection from the mirror. Draw a labelled diagram to represent this situation
Answer
View full question & answer→diagram 47.
Question 211 Mark
State the relation between object distance, image distance and focal length of a spherical mirror (concave mirror or convex mirror).
Answer
View full question & answer→$\frac{1}{\text{image distance}}+\frac{1}{\text{object distance}}=\frac{1}{\text{focal lenght}}$Or
$\frac{1}{\text{v}}+\frac{1}{\text{u}}=\frac{1}{\text{f}}$ v = distance of image from mirror. u = distance of object from mirror. f = focal length of mirror.
$\frac{1}{\text{v}}+\frac{1}{\text{u}}=\frac{1}{\text{f}}$ v = distance of image from mirror. u = distance of object from mirror. f = focal length of mirror.
Question 221 Mark
What is the name of the phenomenon in which the right side of an object appears to be the left side of the image in a plane mirror?
Answer
View full question & answer→Lateral inversion.
Question 231 Mark
For what position of an object, a concave mirror forms a real image equal in size to the object?
Answer
View full question & answer→At the centre of curvature.
Question 241 Mark
If an object is placed at the focus of a concave mirror, where is the image formed?
Answer
View full question & answer→At infinity.
Question 251 Mark
Out of convex mirror and concave mirror, whose focus is situated behind the mirror?
Answer
View full question & answer→Convex mirror.
Question 261 Mark
Draw the following diagram in your answer book and show the formation of image of the object AB with the help of suitable.
Question 271 Mark
A ray of light strikes a plane mirror such that its angle of incidence is 30°. What angle does the reflected ray make with the mirror surface?
Answer
View full question & answer→According to the second law of reflection, angle of incidence is equal to the angle of reflection.
Given angle of incidence = 30°
Therefore, angle of reflection = 30°
Angle made by the reflected ray with mirror surface = 90° - 30° = 60°
Given angle of incidence = 30°
Therefore, angle of reflection = 30°
Angle made by the reflected ray with mirror surface = 90° - 30° = 60°
Question 281 Mark
A ray of light is incident normally on a plane mirror. What will be the:
- Angle of incidence?
- Angle of reflection?
Answer
View full question & answer→- 0°
- 0°
Question 291 Mark
Which mirror always produces a virtual, erect and diminished image of an object?
Answer
View full question & answer→Convex mirror always produces a virtual, erect and diminished image.
Question 301 Mark
Define:centre of curvature.
Answer
Centre of curvature: Centre of curvature of a spherical mirror is the centre of the hollow sphere of glass of which the mirror is a part.
View full question & answer→Centre of curvature: Centre of curvature of a spherical mirror is the centre of the hollow sphere of glass of which the mirror is a part.Question 311 Mark
Complete the following sentence:
All the distances are measured from the _______ of a spherical mirror.
All the distances are measured from the _______ of a spherical mirror.
Answer
View full question & answer→All the distances are measured from the Pole of a spherical mirror.
Question 321 Mark
A ray of light strikes a plane mirror at an angle of 40° to the mirror surface. What will be the angle of reflection?
Answer
View full question & answer→Angle to the mirror surface = 40°Therefore, angle of incidence = 90° - 40° = 50°
According to the second law of reflection, angle of incidence is equal to the angle of reflection.
Therefore, angle of reflection = 50°
According to the second law of reflection, angle of incidence is equal to the angle of reflection.
Therefore, angle of reflection = 50°
Question 331 Mark
Define:pole.
Answer
View full question & answer→Pole: The centre of a spherical mirror is called its pole.
Question 341 Mark
Find the focal length of a concave mirror whose radius of curvature is 32cm.
Answer
View full question & answer→Radius of curvature (R) = 32cmFocal length (f) = ?
We know that
$\text{f}=\frac{\text{R}}{2} $
$=\frac{32}{2}$
$\text{f}=16\text{cm}$
We know that
$\text{f}=\frac{\text{R}}{2} $
$=\frac{32}{2}$
$\text{f}=16\text{cm}$
Question 351 Mark
Define:radius of curvature.
Answer
Radius of curvature: Radius of curvature of a spherical mirror is the radius of the hollow sphere of glass of which the mirror is a part.
View full question & answer→Radius of curvature: Radius of curvature of a spherical mirror is the radius of the hollow sphere of glass of which the mirror is a part.Question 361 Mark
If an object is placed at a distance of 10cm in from of a plane mirror, how far would it be from its image?
Answer
View full question & answer→The image is formed behind the mirror at the same distance as the object is kept in front of the mirror.
Given distance between object and mirror = 10cm.
Distance between mirror and image = 10cm.
Therefore, the distance between object and image = 10 + 10 = 20cm.
Given distance between object and mirror = 10cm.
Distance between mirror and image = 10cm.
Therefore, the distance between object and image = 10 + 10 = 20cm.
Question 371 Mark
If a driver has one convex and one plane rear-view mirror, how would the images in each mirror appear different?
Answer
View full question & answer→The images formed in the convex rear-view mirror will be smaller than those formed in the plane rear-view mirror.
Question 381 Mark
What kind of mirror is required for obtaining a virtual image of the same size as the object?
Answer
View full question & answer→Plane mirror.
Question 391 Mark
What happens to the image when the object is moved away from the mirror gradually?
Answer
View full question & answer→Virtual and erect; real and inverted.
Question 401 Mark
Name the phenomenon responsible for the following effect:
When we sit in front of a plane mirror and write with our right hand, it appears in the mirror that we are writing with the left hand.
When we sit in front of a plane mirror and write with our right hand, it appears in the mirror that we are writing with the left hand.
Answer
View full question & answer→Lateral inversion.
Question 411 Mark
Where should an object be placed in front of the concave mirror so as to obtain its virtual, erect and magnified image?
Answer
View full question & answer→Between pole and focus.
Question 421 Mark
Which type of reflection of light leads to the formation of images?
Answer
View full question & answer→Regular reflection.
Question 431 Mark
What type of mirror could be used:
- As a shaving mirror?
- As a shop security mirror?
Answer
View full question & answer→- Concave mirror.
- Convex mirror.
Question 441 Mark
Name the spherical mirror which can produce a virtual and diminished image of an object.
Answer
View full question & answer→Convex mirror.
Question 451 Mark
Define:Aperture.
Answer
View full question & answer→Aperture: The portion of a mirror from which the reflection of light actually takes place is called the aperture of the mirror.
Question 461 Mark
Copy this figure in your answer book and show the direction of the light ray after reflection:
Question 471 Mark
For which positions of the object does a concave mirror produce an inverted, magnified and real image?
Answer
View full question & answer→Between focus and centre of curvature.
Question 481 Mark
What happens when a ray of light falls normally (or perpendicularly) on the surface of a plane mirror?
Answer
View full question & answer→As ray of light falls normally on mirror, this means that angle of incidence is 0°. From second law of reflection, we know that angle of incidence is equal to angle of reflection. So, angle of reflection will also be zero.Therefore, the light ray will be reflected back along the same path.
Question 491 Mark
One wants to see a magnified image of an object in a mirror. What type of mirror should one use?
Answer
View full question & answer→Concave mirror should be used to get a magnified image.
Question 501 Mark
If an object is at infinity (very large distance) in front of a concave mirror, where is the image formed?
Answer
View full question & answer→At focus.