30 Questions
What is the velocity of the image when a mirror is moving at a velocity v?
3v
If a ray is reflected successively from two plane mirrors inclined at a certain angle, what is the deviation of the ray?
300°
A beam of light is incident on a small plane mirror at the centre of a spherical screen of radius R. If the mirror rotates at a speed of n revolutions per second, what is the speed of the light on the screen after reflection?
4πnR
If a mirror is at rest, what is the velocity of the image?
2v
What is the angle of rotation of the reflected ray when a plane mirror rotates through an angle θ?
2θ
What happens to the emergent ray when two plane mirrors are inclined to each other at 90°, and the ray suffers one reflection from each?
It becomes anti-parallel to the incident ray
If a plane mirror is rotated in the plane of incidence through an angle θ, what happens to the reflected ray?
It turns through an angle 2θ
What is the number of images formed by two inclined plane mirrors with an angle θ between them, where θ is an even integer?
360/θ - 1
When an object moves with speed u towards a plane mirror, what is the speed of the image relative to the object?
2u
What happens when a plane mirror moves towards a stationary object with speed u?
The image moves with speed 2u
What is the minimum length of a mirror required for a person of height h to see their complete image?
h/2
What is the additional phase change caused by reflection from a denser medium?
π
A person is standing in a room with mirrored ceiling and two adjacent walls. How many images of the person will be formed?
Infinity
A plane mirror is inclined at an angle of 30° to the horizontal. A vertical ray strikes the mirror. What is the angle between the mirror and the reflected ray?
60°
A man of height h is standing in front of a mirror. What is the minimum length of the mirror required to see the complete wall behind him, if the wall is of height H?
H/3
What is the direction of the emergent ray relative to the incident ray when two plane mirrors are inclined to each other at an angle θ and the ray suffers one reflection from each?
Anti-parallel to the incident ray
If two plane mirrors are inclined to each other at an angle θ, what is the number of images formed of an object kept between them when θ is an odd integer?
n = (360/θ) - 1
When a plane mirror is rotated in the plane of incidence through an angle θ, what is the angle through which the reflected ray rotates?
2θ
What is the speed of the image relative to the object when the object moves with speed u towards a plane mirror?
2u
If a plane mirror moves towards a stationary object with speed u, what is the speed of the image?
2u
A person is standing in a room with mirrored ceiling and two adjacent walls. What is the minimum number of images that will be formed?
12
A vertical ray strikes a plane mirror inclined at 45° to the horizontal. What is the angle between the mirror and the reflected ray?
135°
If a mirror is moving towards an object with a speed of 2u, what is the velocity of the image relative to the object?
4u
What is the minimum length of a mirror required for a person of height h to see their complete image, if the person is standing in front of the mirror?
h/2
If a plane mirror is rotated through an angle θ, what is the angle of rotation of the reflected ray?
2θ
A plane mirror is rotating at a speed of n revolutions per second, and a beam of light is incident on it. What is the angular velocity of the reflected light on a spherical screen of radius R?
$2\pi n$
Two plane mirrors are inclined at an angle θ, and a ray of light is incident on one of the mirrors. What is the total deviation of the ray after two successive reflections?
$\delta = 360^\circ - 2\theta$
A plane mirror is moving at a velocity v, and an object is moving towards it at a velocity u. What is the velocity of the image relative to the object?
$2v + u$
Two inclined plane mirrors are forming multiple images of an object. What is the condition for the number of images to be finite?
The angle between the mirrors must be a rational multiple of 360°
A small plane mirror is rotating at a speed of n revolutions per second, and a beam of light is incident on it. What is the speed of the light on a spherical screen of radius R after reflection?
$2\pi nR$
Test your understanding of plane mirrors and reflection. Learn about inclined plane mirrors, rotation of mirrors, and the formation of images.
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