Tag: introduction to light and mirror

Quizzes (0) Questions (34)

Questions Related to introduction to light and mirror

Multiple choice evs magic with mirrors image of an extended object formed by a plane mirror reflection at plane surface introduction to light and mirror

On reflection from a rigid body, the wave undergoes a phase change of

  1. $90^{\circ}$
  2. $180^{\circ}$
  3. $210^{\circ}$
  4. $120^{\circ}$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When a wave reflects off a rigid boundary (a medium with higher optical density or a fixed end), it undergoes a phase shift of 180 degrees (or pi radians).

Multiple choice evs magic with mirrors image of an extended object formed by a plane mirror reflection at plane surface introduction to light and mirror

When you see your reflection in the inner surface of the spoon, choose the correct option regarding the image formed

  1. The image formed will be erect only, it can not be inverted

  2. The image formed will be inverted only, it can not be erect

  3. The image formed can be both erect or inverted depending upon distance of your face and the spoon

  4. The image formed will be real
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Since inner surface of spoon act as concave mirror i.e. erect or diminished or virtual or real with varyaccording to position of object.

Multiple choice evs magic with mirrors image of an extended object formed by a plane mirror reflection at plane surface introduction to light and mirror

When a ray of light is incident normally on a plane mirror then the angle of reflection will be?

  1. ${0}^{o}$
  2. ${90}^{o}$
  3. ${180}^{o}$
  4. $-{90}^{o}$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

As angle of incidence and angle of reflection is always equal hence angle of reflection should be $0°$ as normal to the plane incidence means $0°$ is the angle of incidence from normal.

Multiple choice evs magic with mirrors image of an extended object formed by a plane mirror reflection at plane surface introduction to light and mirror

A monochromatic ray of light in glass strikes the glass air interference normally. which of the following correct?

  1. The ray is totally reflected into glass

  2. The ray passes into air such that the
    refracted ray bends away from the normal

  3. The ray passes into air undeviated and with an increase in its speed.

  4. The ray passes into air with an increase in its frequency.
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice evs magic with mirrors image of an extended object formed by a plane mirror reflection at plane surface introduction to light and mirror

Two plane mirrors A and B are aligned parallel to each other, as shown in figure. A light ray is incident at an angle $30$ at a point just inside one end of A. The plane of incidence coincides with the plane of the figure.The maximum number of times the ray undergoes reflections ( including the first one) before it emerges out is:

  1. $28$
  2. $30$
  3. $32$
  4. $34$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

For two parallel mirrors separated by distance d, the number of reflections is determined by the horizontal distance the ray travels. With an angle of 30 degrees, the ray reflects multiple times until it exits. The standard formula for this geometry results in 30 reflections.

Multiple choice evs magic with mirrors image of an extended object formed by a plane mirror reflection at plane surface introduction to light and mirror

Two plane mirrors are inclined to each  other such that  a ray of light incident on the first  mirror $\left( { M } _{ 1 } \right) $ and parallel to the second mirror $\left( { M } _{ 2 } \right) $  is finally reflected from the second mirror $\left( { M } _{ 1 } \right) $ parallel to the two mirroes will  be : 

  1. ${ 90 }^{ 0 }$
  2. ${ 75 }^{ 0 }$
  3. ${ 45 }^{ 0 }$
  4. ${ 60 }^{ 0 }$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

For two mirrors inclined at angle θ, a ray incident parallel to one mirror and exiting parallel to the other after two reflections requires θ = 60°. This can be derived using the fact that the angle of incidence equals angle of reflection, and the total deviation after two reflections is 2θ. The specific path described requires this specific angle.

Multiple choice evs magic with mirrors image of an extended object formed by a plane mirror reflection at plane surface introduction to light and mirror

Two plane mirror are inclined to each other such that a ray of light incident on the first mirror $\left( { M } _{ 1 } \right) $ and parallel to the second mirror $\left( { M } _{ 2 } \right) $ is finally reflected form th second mirror $\left( { M } _{ 2 } \right) $ parallel to the first mirror $\left( { M } _{ 1 } \right) $ the angle between the two mirrors will be :

  1. ${ 60 }^{ 0 }$
  2. $75^{ 0 }$
  3. $90^{ 0 }$
  4. $45^{ 0 }$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Similar to the previous problem, if the ray reflects off the second mirror parallel to the first, the geometry requires an angle of 60 degrees between the mirrors.

Multiple choice evs magic with mirrors image of an extended object formed by a plane mirror reflection at plane surface introduction to light and mirror

If the mirror is displaced by a distance 4 cm, towards the object, the image is displaced by 

  1. 12 cm

  2. 4 cm

  3. 6 cm

  4. 8 cm
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

When a plane mirror is moved by a distance x towards an object, the image moves by 2x towards the object because the distance between the object and the image is reduced by 2x.