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प्रश्न
Mention one difference between reflection of light from a plane mirror and total internal reflection of light from a prism.
Mention the differences between the total internal reflection of light from a prism and the reflection of light from a plane mirror.
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उत्तर
| Sr. No. | Reflection of light from a plane mirror | Total internal reflection of light from a prism |
| 1. | A part of the incident ray of light is reflected, and the remaining is refracted and absorbed. | The incident ray of light is totally reflected back into the denser medium. |
| 2. | Reflection occurs when the ray of light falls on a plane mirror at any angle of incidence from any medium. | Total internal reflection occurs only when the ray of light travels from a denser to rarer medium at an angle of incidence greater than the critical angle. |
| 3. | The energy of the reflected ray of light is less than that of the incident ray due to loss of energy. | It occurs without any loss of energy. The energy of incident and reflected rays of light remains the same. |
| 4. | The brightness of the image formed is less, which gradually reduces as the silvering of the mirror wears out. | A brighter image is formed. |
Notes
Students should refer to the answer according to the question.
संबंधित प्रश्न
A ray of light XY passes through a right-angled isosceles prism as shown below
- What is the angle through which the incident ray deviates and emerges out of the prism?
- Name the instrument where this action of the prism is put into use.
- Which prism surface will behave as a mirror?
What is a total reflecting prism?
Show with the help of a diagram how a total reflecting prism can be used to turn a ray of light through 90°. Name one instrument in which such a prism is used.
In the following figure, a ray of light PQ is incident normally on the hypotenuse of an isosceles right angle prism ABC.
- Complete the path of the ray PQ till it emerges from the prism. Mark in the diagram the angle wherever necessary.
- What is the angle of deviation of the ray PQ?
- Name a device in which this action is used.
What device other than a plane mirror can be used to turn a ray of light through 180°? Draw a diagram in support of your answer. Name an instrument in which this device is used.
In the given figure, a ray of light PQ is incident normally on the face AB of an equilateral glass prism. Complete the ray diagram showing its emergence into air after passing through the prism. Take critical angle for glass = 42°.
- Write the angles of incidence at the faces AB and AC of the prism.
- Name the phenomenon which the ray of light suffers at the face AB, AC and BC of the prism.
Draw a neat labelled ray diagram to show the total internal reflection of a ray of light normally incident on one face of a 30°, 90°, 60° prism.
A total reflecting right angled isosceles prism can be used to deviate a ray of light through ______.
State three actions that a total reflecting prism can produce.
Complete the path of ray PQ through the glass prism ABC shown in Fig. till it emerges out of the prism. Given the critical angle of the glass is 42°.
