Physics-
General
Easy
Question
The circular boundary of the concave mirror subtends a cone of half angle 
at its centre of curvature. The minimum value of for which ray incident on this mirror parallel to the principle axis suffers reflection more than one is
- 30°
- 45°
- 60°
- 75°
The correct answer is: 45°
Related Questions to study
physics-
A concave mirror of focal length 20cm is cut into two parts from the middle and the two parts are moved perpendicularly by a distance 1cm from the previous principle axis AB. The distance between the images formed by the two parts. If the dbject is kept at a distance of 10cm from the pole of the original principal axis is
A concave mirror of focal length 20cm is cut into two parts from the middle and the two parts are moved perpendicularly by a distance 1cm from the previous principle axis AB. The distance between the images formed by the two parts. If the dbject is kept at a distance of 10cm from the pole of the original principal axis is
physics-General
physics-
Two blocks each of mass 
lie on a smooth table. They are attached to two other masses as shown in the figure. The pulleys and strings are light. An object O is kept at rest on the table. The sides AB&CD of the two blocks are made reflecting. The acceleration of two images formed in those two reflecting surfaces w.r.t. each other is:
Two blocks each of mass lie on a smooth table. They are attached to two other masses as shown in the figure. The pulleys and strings are light. An object O is kept at rest on the table. The sides AB&CD of the two blocks are made reflecting. The acceleration of two images formed in those two reflecting surfaces w.r.t. each other is:
physics-General
physics-
A plane mirror M is arranged parallel to a wall W at a distace l from it. The light produced by a point source 'S' kept on the wall is reflected by the mirror and produces a light spot on the wall. The mirror moves with velocity 
towards the wall. Then
A plane mirror M is arranged parallel to a wall W at a distace l from it. The light produced by a point source 'S' kept on the wall is reflected by the mirror and produces a light spot on the wall. The mirror moves with velocity towards the wall. Then
physics-General
physics-
Find the velocity of image of a moving particle O' in the situation as shown in the figure.
Find the velocity of image of a moving particle O' in the situation as shown in the figure.
physics-General
physics-
As shown in the figure, a particle is placed at O in front of a plane mirror M. A man at P can move along path PY and 
. Then which of the following is true?
As shown in the figure, a particle is placed at O in front of a plane mirror M. A man at P can move along path PY and . Then which of the following is true?
physics-General
physics-
Two plane mirrors of length L are separated by distance L and a man 
is standing at distance L from the connecting line of mirrors as shown in figure. A man 
is walking along a straight line at distance 2L parallel to the mirrors at speed u. Then the man at O will be able to see image of for total time of
Two plane mirrors of length L are separated by distance L and a man is standing at distance L from the connecting line of mirrors as shown in figure. A man is walking along a straight line at distance 2L parallel to the mirrors at speed u. Then the man at O will be able to see image of for total time of
physics-General
physics-
Two mirrors AB and CD are arranged along two parallel lines. The maximum number of images of object O that can be seen by any observer is
Two mirrors AB and CD are arranged along two parallel lines. The maximum number of images of object O that can be seen by any observer is
physics-General
physics-
A luminous point source ' s ' is placed between a plane mirror and a screen in the situation as shown in figure. Then the length of screen which will receive direct light as well as reflected lightis
A luminous point source ' s ' is placed between a plane mirror and a screen in the situation as shown in figure. Then the length of screen which will receive direct light as well as reflected lightis
physics-General
physics-
What are the co-ordinates of the image of S formed by a plane mirror as shown in figure?
What are the co-ordinates of the image of S formed by a plane mirror as shown in figure?
physics-General
physics-
Sun rays are reflected from a horizontal mirror and fall on a vertical screen. A vertical object of height h is placed on the mirror as shown in the figure. Length of the shadow on the screen is
Sun rays are reflected from a horizontal mirror and fall on a vertical screen. A vertical object of height h is placed on the mirror as shown in the figure. Length of the shadow on the screen is
physics-General
physics-
Three plane mirrors are placed such that the angle between the first and second or second and third is the same ' '. A light striking the first mirror, after reflection at the three mirrors emerges qoposite to the initial direction. Find the value of ' '.
Three plane mirrors are placed such that the angle between the first and second or second and third is the same ' '. A light striking the first mirror, after reflection at the three mirrors emerges qoposite to the initial direction. Find the value of ' '.
physics-General
physics-
Calculate the deviation suffered by incident ray in situation as shown in figure after three successive reflections.
Calculate the deviation suffered by incident ray in situation as shown in figure after three successive reflections.
physics-General
physics-
Two mirrors, labeled IM for left mirror and RM for right mirror in the adjacent figure, are parallel to each other and 3.0m apart. A person standing 1.0m from the right mirror (RM) looks into this mirror and sees a series of images. How far from the person is the second closest image seen in the right mirror (RM)?
Two mirrors, labeled IM for left mirror and RM for right mirror in the adjacent figure, are parallel to each other and 3.0m apart. A person standing 1.0m from the right mirror (RM) looks into this mirror and sees a series of images. How far from the person is the second closest image seen in the right mirror (RM)?
physics-General
physics-
The capacitors in figure are initially uncharged and are connected as in the diagram with switch S open. The applied potential difference is 
.
How much charge flowed through the switch when it was closed
The capacitors in figure are initially uncharged and are connected as in the diagram with switch S open. The applied potential difference is .
How much charge flowed through the switch when it was closed
physics-General
physics-
The capacitors in figure are initially uncharged and are connected as in the diagram with switch S open. The applied potential difference is .
What is the potential difference across each capacitor after switch S is closed
The capacitors in figure are initially uncharged and are connected as in the diagram with switch S open. The applied potential difference is .
What is the potential difference across each capacitor after switch S is closed
physics-General
