Physics
Grade-10
Easy
Question
A paper on which the image of the Sun is formed by a concave mirror catches a fire as ___.
- The sun rays get concentrated at a point on the paper
- The mirror heats the paper up
- The paper is moved close to the sun
- None of the above
Hint:
The sun rays get concentrated at a point on the paper.
The correct answer is: The sun rays get concentrated at a point on the paper
All the rays coming from the sun meet at focus after getting reflected. That is all the energy of rays that strike the mirror is concentrated at the focus because of the mirror. If a paper is kept at the focus and the alignment of the whole setup is not changed for an adequate amount of time, because of the concentrated energy of the sun, by the virtue of the concave mirror, the paper starts to burn.
Related Questions to study
Physics
The spherical mirrors are the pieces cut from a hollow glass sphere ____ on one of their surfaces.
The spherical mirrors are the pieces cut from a hollow glass sphere ____ on one of their surfaces.
PhysicsGrade-10
Physics
The SI unit of measurement of focal length is ____.
The SI unit of measurement of focal length is ____.
PhysicsGrade-10
Physics
The distance between the pole and the focus of a spherical mirror is called the ____.
The distance between the pole and the focus of a spherical mirror is called the ____.
PhysicsGrade-10
Physics
_____ is the radius of the hollow glass sphere from where the spherical mirrors are cut.
_____ is the radius of the hollow glass sphere from where the spherical mirrors are cut.
PhysicsGrade-10
Physics
The center of the reflecting surface of a spherical mirror is called its ____.
The center of the reflecting surface of a spherical mirror is called its ____.
PhysicsGrade-10
Physics
_____ is the diameter of the rim of a spherical mirror.
_____ is the diameter of the rim of a spherical mirror.
PhysicsGrade-10
Physics
The angle of incidence is equal to the angle of reflection of light _____.
The angle of incidence is equal to the angle of reflection of light _____.
PhysicsGrade-10
Physics
The angle made by the reflected ray with the normal is 42 degrees. The angle of incidence is ____ degrees.
The angle made by the reflected ray with the normal is 42 degrees. The angle of incidence is ____ degrees.
PhysicsGrade-10
Physics
A reflected ray makes an angle of 65 degrees with the reflecting surface. The angle of incidence is ____ degrees.
A reflected ray makes an angle of 65 degrees with the reflecting surface. The angle of incidence is ____ degrees.
PhysicsGrade-10
Physics
An incident ray makes an angle of 30 degrees with the reflecting surface. The angle of incidence is ____ degrees.
An incident ray makes an angle of 30 degrees with the reflecting surface. The angle of incidence is ____ degrees.
PhysicsGrade-10
Physics
An incident ray goes along the normal. Its angle of incidence is ____ degrees.
An incident ray goes along the normal. Its angle of incidence is ____ degrees.
PhysicsGrade-10
Physics
The two laws of reflection of light hold for reflection of light from _____.
The two laws of reflection of light hold for reflection of light from _____.
PhysicsGrade-10
Physics
For a spherical mirror, a normal line at a point is drawn _____.
For a spherical mirror, a normal line at a point is drawn _____.
PhysicsGrade-10
Physics
According to the laws of reflection of light, which of these does not lie on the same plane as the rest?
According to the laws of reflection of light, which of these does not lie on the same plane as the rest?
PhysicsGrade-10
Physics
A convex mirror has its concave surface as _____.
A convex mirror has its concave surface as _____.
PhysicsGrade-10
