why light doesn't deviate if the incident angle is 90° during refraction when even the medium is changed??

Question

Answer

It does not deviate because the angle is 90�..which means..the...ray of light is perpendicular....even when the medius is changed..

Answer

the real answer is understood if you consider the laws of refraction.the snell's law states that the sine of angle of incidence to the sine of angle of refraction is always a constant for a given pair of media.now here angle of incidence is 90 degreesthat means the incident ray do not hit the surface of the other medium...instead it runs along the surface of the other medium.in this case the light ray shall not deviate as the light ray is not travelling from one medium to another but travelling in the same medium, thus it shall remain undeviated and go straight.

Answer

Understanding Refraction at 90° Incidence
When light travels from one medium to another, it typically bends or refracts due to a change in speed. However, when the angle of incidence is 90°, an interesting phenomenon occurs.
What Happens at 90° Incidence?
- Normal Incidence: When light hits the boundary of two media at 90 degrees, it strikes the surface head-on.
- No Change in Direction: The light ray does not deviate; it continues straight into the new medium.
Reasons for No Deviation
- Equal Speed: At 90° incidence, the angle between the incident ray and the normal (an imaginary line perpendicular to the surface) is zero. The light enters the new medium without any angle, maintaining its path.
- Medium Change: Regardless of the refractive indices of the two media, the light's path remains unchanged due to the direct alignment with the normal.
Implications of This Phenomenon
- Practical Applications: Understanding this principle is crucial in fields like optics and fiber optics, where precise control of light direction is essential.
- Optical Devices: Devices like lenses and prisms utilize the principles of refraction but must account for varying angles of incidence to manipulate light effectively.
In summary, when light strikes a boundary at a 90° angle, it does not deviate because it enters the new medium without any angular change, maintaining its original trajectory. This principle is fundamental to understanding light behavior in optics.

Similar Class 10 Doubts

why does a light ray doesn't deviate during refraction if the incidence angle is 0° however the medium is changing??

why light doesn't deviate when incident angle is 90° during refraction

When light goes from an optically rarer to an optically denser medium,

Light changes its path as the medium changes during the transit. This is because of

State the Snell's law of refraction of light. Write an expression to relate refractive index from a medium with respect to light in vacuum.?

Top Courses for Class 10View all

Science Class 10

Social Studies (SST) Class 10

Mathematics (Maths) Class 10

English Grammar Advanced

English Grammar Basic

Top Courses for Class 10

Top Courses for Class 10

Suggested Free Tests

Related Content

About Class 10

Class 10 Study Material

Class 10 All Subjects

NCERT Textbook Solutions

Other Classes

Important Links

Company