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Science Answer the questions.[Phy-1M]

Reflection of Light · CBSE STD 10 (CBSE - English Medium). 64 questions.

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Answer the questions.[Phy-1M]

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Question 11 Mark
Write the mirror formula. Give the meaning of each symbol which occurs in it.
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.

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Question 41 Mark
Which type of mirror has:
  1. Positive focal length?
  2. Negative focal length?
Answer
  1. Convex mirror.
  2. Concave mirror.
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Question 61 Mark
Which property of light makes a pencil cast a shadow when it is held in front of a light source?
Answer
Light travels in straight lines.
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Question 71 Mark
Which one of these circumstances enables a concave mirror to be used as a shaving mirror?
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.
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Question 91 Mark
Which mirror always produces a virtual, erect and diminished image of an object?
Answer
Convex mirror always produces a virtual, erect and diminished image.
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Question 101 Mark
Where should an object be placed in front of the concave mirror so as to obtain its virtual, erect and magnified image?
Answer
Between pole and focus.
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Question 121 Mark
What type of mirror could be used:
  1. As a shaving mirror?
  2. As a shop security mirror?
Answer
  1. Concave mirror.
  2. Convex mirror.
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Question 131 Mark
What type of image is formed:
  1. In a plane mirror?
  2. On a cinema screen?
Answer
  1. Virtual image.
  2. Real image.
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Question 141 Mark
What type of image/ images are formed by:
  1. A convex mirror?
  2. A concave mirror?
Answer
  1. Virtual and erect.
  2. Virtual and erect; real and inverted.
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Question 151 Mark
What sign (+ve or -ve) has been given to the following on the basis of Cartesian Sign Convention?
  1. Height of a real image.
  2. Height of a virtual image.
Answer
  1. Negative.
  2. Positive.
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Question 161 Mark
What kind of mirrors are used in big shopping centres to watch the activities of the customers?
Answer
Convex mirrors.
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Question 171 Mark
What kind of mirror is required for obtaining a virtual image of the same size as the object?
Answer
Plane mirror.
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Question 181 Mark
What kind of mirror can have a focal length of, – 20cm?
Answer
Concave mirror (since focal length is negative).
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Question 191 Mark
What is the ratio of the height of an image to the height of an object known as?
Answer
The ratio of the height of an image to the height of an object known as magnifincation.
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Question 201 Mark
What is the nature of a mirror having a focal length of, + 10cm?
Answer
Convex mirror (since focal length is positive).
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Question 211 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
Lateral inversion.
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Question 221 Mark
What happens when a ray of light falls normally (or perpendicularly) on the surface of a plane mirror?
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.

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Question 231 Mark
What happens to the image when the object is moved away from the mirror gradually?
Answer
Virtual and erect; real and inverted.
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Question 241 Mark
The image seen in a plane mirror cannot be formed on a screen. What name is given to this type of image?
Answer
Virtual image.
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Question 261 Mark
State the relation between object distance, image distance and focal length of a spherical mirror (concave mirror or convex mirror).
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.

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Question 271 Mark
State one use of concave mirror based on the formation of image as in case (z) above.
Answer
one use of concave mirror based on the formation of image as in case (i) above: As a shaving mirror.
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Question 281 Mark
Out of convex mirror and concave mirror, whose focus is situated behind the mirror?
Answer
Convex mirror.
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Question 291 Mark
One wants to see a magnified image of an object in a mirror. What type of mirror should one use?
Answer
Concave mirror should be used to get a magnified image.
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Question 321 Mark
Name the spherical mirror which can produce a virtual and diminished image of an object.
Answer
Convex mirror.
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Question 331 Mark
Name the spherical mirror which can produce a real and diminished image of an object.
Answer
Concave mirror.
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Question 341 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.
Answer
Lateral inversion.
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Question 351 Mark
Name the mirror which can give:
  1. An erect and enlarged image of an object.
  2. An erect and diminished image of an object.
Answer
  1. Concave mirror.
  2. Convex mirror.
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Question 361 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
Concave mirror.
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Question 371 Mark
If the focal length of a convex mirror is 25cm, what is its radius of curvature?
Answer
Focal length (f) = 25cm

Radius of curvature (R) = ?

We know that

$\text{f}=\frac{\text{R}}{2} $

$\text{R}=\frac{R}{2}$

$\text{R}=25\times2$

$\text{R}=50\text{cm}$

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Question 391 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
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.
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Question 401 Mark
If an object is at infinity (very large distance) in front of a concave mirror, where is the image formed?
Answer
At focus.
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Question 411 Mark
If a driver has one convex and one plane rear-view mirror, how would the images in each mirror appear different?
Answer
The images formed in the convex rear-view mirror will be smaller than those formed in the plane rear-view mirror.
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Question 421 Mark
For which positions of the object does a concave mirror produce an inverted, magnified and real image?
Answer
Between focus and centre of curvature.
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Question 431 Mark
For what position of an object, a real and diminished image is formed by a concave mirror?
Answer
Beyond the centre of curvature.
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Question 441 Mark
For what position of an object, a concave mirror forms a real image equal in size to the object?
Answer
At the centre of curvature.
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Question 451 Mark
Find the focal length of a concave mirror whose radius of curvature is 32cm.
Answer
Radius of curvature (R) = 32cm

Focal length (f) = ?

We know that

$\text{f}=\frac{\text{R}}{2} $

$=\frac{32}{2}$

$\text{f}=16\text{cm}$

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Question 461 Mark
Draw the following diagram in your answer book and show the formation of image of the object AB with the help of suitable.
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Question 471 Mark
Draw the following diagram in your answer book and show the formation of image of the object AB with the help of suitable.
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Question 491 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
Coming soon
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Question 501 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.
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