Question:
A ray of light travelling in water is incident on its surface open to air. The angle of incidence is $\theta$, which is less than the critical angle. Then there will be
A ray of light travelling in water is incident on its surface open to air. The angle of incidence is $\theta$, which is less than the critical angle. Then there will be
Updated On: Jun 14, 2022
- only a reflected ray and no refracted ray
- only a refracted ray and no reflected ray
- a reflected ray and a refracted ray and the angle between them would be less than $180^\circ - 2 \theta$
- a reflected ray and a refracted ray and the angle between them would be greater than $180^\circ - 2 \theta$
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The Correct Option is C
Solution and Explanation
Since, $\theta < \theta_c, $ both reflection and refraction will take place.
From the figure we can see that angle between reflected and
refracted rays a is less than $180^\circ - 2 \theta.$
$\therefore$ Option (c) is correct
From the figure we can see that angle between reflected and
refracted rays a is less than $180^\circ - 2 \theta.$
$\therefore$ Option (c) is correct
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Concepts Used:
Ray Optics and Optical Instruments
Optics, deals with the determination of behaviour and the properties of light, along with its interactions with the matter and also with the instruments that are used to detect it.
Ray optics is also known as the geometrical optics and it is a branch of science which describes light propagation.
Reflection is the change in direction of light at an interface in-between two different media so that the wave-front returns into a medium from which it was originated.
Speed of light is the rate at which the light travels in free space.
A phenomenal change in image formed when the light is passed from one medium to another which is called Refraction.
Total Internal Reflection is the reflection of light when the light ray enters into a rarer medium from a denser medium and the angle of incidence is higher than the critical angle of incidence then that light ray will be reflected back to the denser medium.
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