Maths-
General
Easy
Question
Find the value of a+b in the given figure
- 90°
- 75°
- 180°
- 360°
The correct answer is: 75°
Related Questions to study
physics-
The figure shows a ray incident at an angle 
. If the plot drawn shown the variation of 
versus 
, (r=angle of refraction
The figure shows a ray incident at an angle . If the plot drawn shown the variation of versus , (r=angle of refraction
physics-General
physics-
The refracting media are separated by a spherical interface as shown in the figure. PP' is the principal axis, 
and 
are the refractive indices of medium of incidence and medium of refraction respectively. Then :
The refracting media are separated by a spherical interface as shown in the figure. PP' is the principal axis, and are the refractive indices of medium of incidence and medium of refraction respectively. Then :
physics-General
physics-
In the figure shown a point object 0 is placed in air on the principal axis. The radius of curvature of the spherical surface is 60 cm. If is the final image formed after all the refractions and reflections.
In the figure shown a point object 0 is placed in air on the principal axis. The radius of curvature of the spherical surface is 60 cm. If is the final image formed after all the refractions and reflections.
physics-General
physics-
In the diagram shown, a ray of light is incident on the interface between 1 and 2 at angle slightly greater than critical angle. The light suffers total internal reflection at this interface. After that the light ray falls at the interface of 1 and 3, and again it suffers total internal reflection. Which of the following relations should hold true?
In the diagram shown, a ray of light is incident on the interface between 1 and 2 at angle slightly greater than critical angle. The light suffers total internal reflection at this interface. After that the light ray falls at the interface of 1 and 3, and again it suffers total internal reflection. Which of the following relations should hold true?
physics-General
physics-
A curved surface of radius 
separates two medium of refractive indices 
and 
as shown in figures A and B
Identify the correct statement (s) related to the formation of images of a real object placed at x from the pole of the concave surface, as shown in figure B
A curved surface of radius separates two medium of refractive indices and as shown in figures A and B
Identify the correct statement (s) related to the formation of images of a real object placed at x from the pole of the concave surface, as shown in figure B
physics-General
physics-
Three right angled prisms of refractive indices 
and 
are fixed together using an optical glue as shown in figure. If a ray passes through the prisms without suffering any deviation, then
Three right angled prisms of refractive indices and are fixed together using an optical glue as shown in figure. If a ray passes through the prisms without suffering any deviation, then
physics-General
physics-
In n similar thin prisms of same material and refractive index are arranged in series as shown :
In n similar thin prisms of same material and refractive index are arranged in series as shown :
physics-General
physics-
Figure shows the graph of angle of deviation 
versus angle of incidence i for a light ray striking a prism. The prism angle is :
Figure shows the graph of angle of deviation versus angle of incidence i for a light ray striking a prism. The prism angle is :
physics-General
physics-
A vertical light ray strikes a plane mirror kept inclined at an angle of 45° to the horizontal. The reflected ray is horizontal as shown in fig. A glass prism with refracting angle 6° is placed in the path of the reflected ray. In what way and by how much should the mirror be rotated, if the total deviation of the light ray is to be 90° ?
A vertical light ray strikes a plane mirror kept inclined at an angle of 45° to the horizontal. The reflected ray is horizontal as shown in fig. A glass prism with refracting angle 6° is placed in the path of the reflected ray. In what way and by how much should the mirror be rotated, if the total deviation of the light ray is to be 90° ?
physics-General
physics-
A fixed cylindrical tank of height H=4 m and area 
, is filled up with a liquid. An observer through a telescope fitted at the top of the wall of the tank and inclined at 
with the vertical. When the tank is completely filled with liquid, he notices an insect, which is at the centre of the bottom of the tank. At t=0, he opens a cork of area a at the bottom of the tank. The insect moves in such a way that it is visible for a certain time. Find the refractive indexof the liquid
A fixed cylindrical tank of height H=4 m and area , is filled up with a liquid. An observer through a telescope fitted at the top of the wall of the tank and inclined at with the vertical. When the tank is completely filled with liquid, he notices an insect, which is at the centre of the bottom of the tank. At t=0, he opens a cork of area a at the bottom of the tank. The insect moves in such a way that it is visible for a certain time. Find the refractive indexof the liquid
physics-General
physics-
A medium (M) having refractive index 2 is placed in air. Its pole is at origin. A point object at (-10 cm,0) starts moving towards the surface with velocity 
at 45° with principal axis. [R=20 cm]
Velocity of image along ' 
' direction is ___________ ms–1
A medium (M) having refractive index 2 is placed in air. Its pole is at origin. A point object at (-10 cm,0) starts moving towards the surface with velocity at 45° with principal axis. [R=20 cm]
Velocity of image along ' ' direction is ___________ ms–1
physics-General
physics-
The time required for the light to go from A to B, when a ray of light goes from point A in a medium where the speed of light is 
to a point 
in a medium where the speed of light is 
as shown in figure, is:
The time required for the light to go from A to B, when a ray of light goes from point A in a medium where the speed of light is to a point in a medium where the speed of light is as shown in figure, is:
physics-General
physics-
It is found that electromagnetic signals sent inside glass sphere from A towards B reach point C. The speed of electromagnetic signals in glass cannot be:
It is found that electromagnetic signals sent inside glass sphere from A towards B reach point C. The speed of electromagnetic signals in glass cannot be:
physics-General
physics-
In the figure ABC is the cross section of a right angled prism and BCDE is the cross section of a glass slab. The value of 
so that light incident normally on the face AB does not cross the face BC is (given 
In the figure ABC is the cross section of a right angled prism and BCDE is the cross section of a glass slab. The value of so that light incident normally on the face AB does not cross the face BC is (given
physics-General
physics-
An object is placed in front of a convex mirror at a distance of 50 cm. A plane mirror is introduced covering the lower half of the convex mirror. If the distance between the object and the plane mirror is 30 cm, it is found that there is no parallax between the images formed by the two mirrors. What is the radius of curvature of the convex mirror?
An object is placed in front of a convex mirror at a distance of 50 cm. A plane mirror is introduced covering the lower half of the convex mirror. If the distance between the object and the plane mirror is 30 cm, it is found that there is no parallax between the images formed by the two mirrors. What is the radius of curvature of the convex mirror?
physics-General
