Advertisements
Advertisements
प्रश्न
Why does a light ray incident on a rectangular glass slab immersed in any medium emerges parallel to itself? Explain using a diagram.
Advertisements
उत्तर
Consider the diagram shown below in which EO is incident ray, OO' is refracted ray and O'H is emergent ray.
Here, AB is the air-glass interface and CD is the glass-air interface. The extent of bending of ray of light at opposite and parallel faces AB and CD of the rectangular glass slab is equal and opposite.
Here, angle i1 = r2 and angle r1 = i2
Hence, the ray emerges parallel to the incident ray.
APPEARS IN
संबंधित प्रश्न
State the characteristics of the image formed by a plane mirror.
Write true or false of the following statement.
The image formed by a plane mirror is real
Fill in the blank
The image formed by a plane mirror is at a distance behind the mirror as ________
How is the position of image formed by a plane mirror related to the position of the object ?
Wirte down the letter C and I as seen in a plane mirror.
State which surface of a plane mirror reflects most of the light incident on it: the front smooth surface or the back silvered surface.
Draw a diagram to show the reflection of a ray of light using a plane mirror. In the diagram, label the incident ray, the reflected ray, the normal, the angle of incidence and the angle of reflection.
A converging mirror, forms three times magnified virtual image when an object is placed at a distance of 8 cm from it. Calculate:
- the position of the image
- the focal length of the mirror.
An object OA is placed on the principal axis of a concave mirror as shown in the figure. Copy and complete the diagram to show the formation of image.
State whether the following statement is true or false. If false, correct it.
If the incident ray makes an angle of Xo with the normal, then the reflected ray is 2Xo.
Complete the ray diagram to show the image observed by the eye after reflection in the following figure.
Differentiate between a reflection and a shadow
State the direction of incident ray which after reflection from a spherical mirror retraces its path. Give reason for your answer.
Plane mirrors are used as looking glass, to reflect light on objects and in periscopes.
Select the WRONG statement in case of image formed by a plane mirror.
Play with a mirror
Write your name with a sketch pen on a thin sheet of paper, polythene or glass. Read your name on the sheet while standing in front of a plane mirror. Now look at your image in the mirror.
