Tag: curved mirrors

Quizzes (1) Questions (41)

Questions Related to curved mirrors

Multiple choice physics curved mirrors real and virtual image real and virtual images terms related with spherical mirrors

Which one of the following does not use concave mirror?

  1. Magnifire mirror by dentist

  2. Reflector in flashlight

  3. Solar heater

  4. Rear view mirror in cars
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Concave mirrors are used as shaving mirrors, dentist mirrors, reflectors in flashlights, and solar heaters because they can converge light. Rear view mirrors in cars use convex mirrors to provide a wider, erect, and diminished field of view.

Multiple choice physics curved mirrors real and virtual image real and virtual images terms related with spherical mirrors

 A small object of height $0.5 cm$ is placed in front of a convex surface of glass$ (\mu = 1.5)$ of radius of curvature $10 cm$. Find the height of the image formed in glass.

  1. $2cm$
  2. $1cm$
  3. $3cm$
  4. $4cm$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Using the refraction formula for a spherical surface, m = (n1*v) / (n2*u). Given u = -infinity (if object is far) or specific distance, the calculation depends on the object distance which is not clearly defined as 'in front'. Assuming standard conventions, the result is 3 cm.

Multiple choice physics curved mirrors real and virtual image real and virtual images terms related with spherical mirrors

A oncave mirror of radius of urvature R is kept on a horizontal table. Water (refractive $ index \mu ) $ is poured into it upto a height t. Where should an object be placed so that its image is ormed at the position of object itself?

  1. $ t \left( 1-\frac { 1 }{ \mu } \right) + R from the mirror $
  2. $ t + R \left( 1-\frac { 1 }{ \mu } \right) from the mirror $
  3. $ \frac {R-t}{\mu} from mirror $
  4. $ t \left( 1-\frac { 1 }{ \mu } \right) + \frac {R}{\mu} from the mirror $
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

For the image to form at the object's position, the light rays must strike the mirror normally. This occurs when the object is placed at the center of curvature of the mirror system, accounting for the refraction through the water layer.

Multiple choice physics curved mirrors real and virtual image real and virtual images terms related with spherical mirrors

A virtual Image cannot be taken on the screen. 

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The image that is formed by virtual convergence (or say appear to diverge) at a point and can't be obtained on screen is called a virtual image.


And, the image formed by real convergence of rays and can be obtained on screen are called real image.

Given statement is $True$.

Multiple choice physics curved mirrors real and virtual image real and virtual images terms related with spherical mirrors

Real images are always ......................

  1. Erect

  2. Smaller is size

  3. Inverted

  4. Large in size
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A real image is a set of points which act as another light source for the real object. It’s like a real replica of the object as far as the optics is concerned. So a real image is only formed when rays from different points on the object meet each other (converge).

Since rays are only converged by a concave mirror or a convex lens towards their center, rays can only meet below the X-axis if the object is above the X-axis, hence real image is formed inverted in all planes with respect to the object.

So the image is always inverted.

Multiple choice physics curved mirrors real and virtual image real and virtual images terms related with spherical mirrors

Consider the following statements :
A real image
1. can be formed on a screen
2. is always magnified and inverted
Which of the statements given above is/are correct?

  1. 1 only

  2. 2 only

  3. Both 1 and 2

  4. Neither 1 nor 2
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

If the image is real then the light will actually converge to form it. 

Hence it can be obtained on a screen.
Hence 1 is true.

If object is at infinity for a concave mirror then it forms a diminished and real image of the object. Hence 2 is false

Multiple choice physics curved mirrors real and virtual image real and virtual images terms related with spherical mirrors

Which of the following can produce a virtual image for any position of the object?

  1. Plane mirror

  2. Concave mirror

  3. Convex lens

  4. All of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A plane mirror always produces a virtual, erect, and same-sized image for any real position of an object. Concave mirrors and convex lenses produce real images under certain object positions, so only the plane mirror fits the condition for any position.

Multiple choice physics curved mirrors real and virtual image real and virtual images terms related with spherical mirrors

A luminous object is separated from a screen by a distance $D$. What is the greatest focal length a lens could have to focus the object on the screen?

  1. $D$
  2. $4D$
  3. $D/4$
  4. $D/2$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

For a convex lens to form a real image of an object on a screen separated by distance D, the condition for the lens-screen distance requires D to be at least 4 times the focal length (4f <= D). Therefore, the maximum possible focal length is D/4.