Tag: evs

Questions Related to evs

Virtual image is always erect

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

  1. True

  2. False

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Correct Option: A
Explanation:

As we can observe from all the virtual images formed by plane mirror or curved mirror,virtual images are always erect.

Formation of erect image is a characteristic of which of the following mirrors ?

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

  1. Plane Mirror

  2. Concave mirror

  3. Convex mirror

  4. All the above

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Correct Option: D
Explanation:
$ \bf{Convex\ mirrors} $ always produce a virtual, erect and diminished image and the decrease in size of image depends on the position of the object in front of the mirror.

$ \bf{Plane\ Mirrors} $ always produce a virtual and erect image having the same size as that of the object irrespective of the position of object.

$ \bf{Concave\ mirrors} $ produce real and virtual, erect and inverted, diminished, same-sized and magnified image depending upon the position of the object on the principal axis. The concave mirror forms a virtual and erect image only when the object is placed between the Focus and the pole of the mirror.

Thus, an erect image can be formed by all the three mirrors.

Hence, the correct answer is OPTION D.

Choose the correct option regarding the image formed by a plane mirror

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

  1. It is real

  2. It is erect

  3. It is inverted

  4. None of the above

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Correct Option: B
Explanation:

A $ \bf{plane\ mirror} $ always forms an image which is $ \bf{virtual} $ in nature (meaning that light rays meet behind the mirror or that light rays do not actually come from the image), $ \bf{erect} $ and of the $ \bf{same\ shape\ and\ size} $ as that of the object, it is reflecting.

Hence, the correct answer is OPTION B. 

Which of the following is a characteristic of the image formed by a plane mirror ?

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

  1. The image is twice in size as the object.

  2. The image is nearer from the mirror as the object is in front of it.

  3. The image is real

  4. The image is erect

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Correct Option: D
Explanation:

A $ \bf{plane\ mirror} $ always forms an image which is $ \bf{virtual} $ in nature (meaning that light rays meet behind the mirror or that light rays do not actually come from the image), $ \bf{erect} $ and of the $ \bf{same\ shape\ and\ size} $ as that of the object, it is reflecting. The image in  plane mirror is formed as far behind the mirror as the object in front of it. 

Hence, the correct answer is OPTION D. 

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

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

  1. $90^{\circ}$

  2. $180^{\circ}$

  3. $210^{\circ}$

  4. $120^{\circ}$

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Correct Option: B

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

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

  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

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Correct Option: C
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.

A small object is placed 10cm in front of a plane mirror. If you stand behind the object 30 cm from the object and look at its image, the distance focused for your eye will be :

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

  1. $60 cm$

  2. $20cm$

  3. $40 cm$

  4. $80 cm$

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Correct Option: C

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

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

  1. ${0}^{o}$

  2. ${90}^{o}$

  3. ${180}^{o}$

  4. $-{90}^{o}$

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Correct Option: A
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.

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

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

  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.

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Correct Option: A

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:

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

  1. $28$

  2. $30$

  3. $32$

  4. $34$

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Correct Option: B