Question Bank On Reflection

Questions on Reflection

As per the CBSE, these objectives questions are helpful in the preparation of practical exam and also an objective question which is asked by the board in final exams

1. What is the reflection of light?
2. What are the laws of reflection of light?
3. Differentiate between real and virtual images?
4. What are the characteristics of the image formed by the plane mirror?
5. Fill  In The Blanks:

a) The height of 5cm which is placed in front of a plane mirror. The height of the virtual image is...........
b) Light is an ..............wave.
c) The speed of the light in a vacuum is ...............
d) The speed of light is highest in................ and its value is ................
e) The radius of curvature of a plane mirror is ...................
f) The wavelength range of visible is from ..............m to .............m
g) ............. metal is the best reflector of light.
h) In-plane mirror the angle of incidence is 37 degrees, the angle of reflection is ..............
i) Objects which emits their own lights are called ...................................... objects.
j) An object is placed 20cm in front of a plane mirror. The distance between the object and its virtual image is.....................

    6) True or False:
a) Light can travel in a vacuum.
b) Normal incidence means the angle of incidence is zero.
c) The speed of light is the same in all mediums.
d) Moon is a luminous object.
e) A highly polished surface is a good reflector of light.
f) In a plane mirror size of the object is the same as the size of the image.
g) A transparent medium is a good transmitter of light.


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REFLECTION

REFLECTION OF LIGHT:

Reflection of light is the phenomenon of bouncing back of light in the same medium when the light striking the surface.

Take a plane glass sheet whose one side is coated with the thin layer of silver metal. Silver is used because it is the best reflector of light (remember that silver is the best reflector of light).To avoid the removal of the silver metal layer, red paint is coated on it. So when the light falls on the surface it bounces back.

Laws Of Reflection

1) The incident ray, the reflected ray and the normal all lie in the same plane.

2) The angle of incidence is always equal to the angle of reflection.

Special Case:

If the incident ray falls at a right angle on the mirror or we can also say (normal or perpendicular to at 90 degrees) here the angle of incidence os zero degrees.

OBJECT AND IMAGE

An object is the one which we want to see or we can say that an object can either reflect light which incident on it or it can emit its own light. We can see everyone ( objects or persons) all can reflect light which can fall on it. There are two types of images :

1) Real Image: A real image is formed by the intersection of rays of light at a point. This image can be seen if a screen is placed at that point. A real image is formed in front of a mirror

2) Virtual Image: An image that is formed at a point from where the reflected light rays appear to diverge. A virtual image cannot be projected on a screen. That is a virtual image is formed behind a mirror.

Difference Between Real And Virtual Image

                 Real Image                                                                       Virtual Image

1) It is formed by the actual intersection of                          1) It is formed when the reflected ray do 

    light ray.                                                                                 not actually meet.

2) It can be projected on a screen.                                         2) It cannot be projected on a screen.

3) It is formed in front of a mirror                                         3) It is formed behind the mirror.

Characteristics of Image formed by Plane Mirror

1. An image formed is virtual and erect.
2. The distance of the image is always equal to the distance of the image from the mirror.
3. object size is equal to the image size.
4. The image is laterally inverted.

Use of Plane Mirror

1. It is used in dressing mirrors as looking glass.
2. It is in the barber's shop.
3. It is used in periscopes.
4. It is used in the solar cooker.

 

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