Tag: physics

Questions Related to physics

The image formed by a convex mirror of focal length 30 cm is a quarter of the size of the object. The distance of the object from the mirror is 

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

  1. 30 cm

  2. 90 cm

  3. 120 cm

  4. 60 cm

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Correct Option: C

The distance of an object from the pole of a concave mirror is equal to its radius of curvature. The image must be

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

  1. real

  2. inverted

  3. same sized

  4. erect

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Correct Option: A,B,C

Which one of the following does not use concave mirror?

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

  1. Magnifire mirror by dentist

  2. Reflector in flashlight

  3. Solar heater

  4. Rear view mirror in cars

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Correct Option: C

 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.

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

  1. $2cm$

  2. $1cm$

  3. $3cm$

  4. $4cm$

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Correct Option: C

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?

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

  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 $

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Correct Option: C

A virtual image is

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

  1. always magnified

  2. always erect

  3. always caught on a screen

  4. uncapturable on a screen

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Correct Option: D
Explanation:

Virtual images cannot be captured on a screen.

A virtual Image cannot be taken on the screen. 

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

  1. True

  2. False

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Correct Option: A
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 $True$.

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

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

  1. Erect

  2. Smaller is size

  3. Inverted

  4. Large in size

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Correct Option: C
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.

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?

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

  1. 1 only

  2. 2 only

  3. Both 1 and 2

  4. Neither 1 nor 2

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Correct Option: A
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

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

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

  1. Plane mirror

  2. Concave mirror

  3. Convex lens

  4. All of the above

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Correct Option: C