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If by "straight on" you mean at 90 degrees to the surface of the medium, that is because light is only deviated if it makes an angle with the normal, which is an imaginary line perpendicular to the surface of the medium. If no angle is made between the normal line and the light ray, then no refraction occurs and the light passes through in a straight line.

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13y ago
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3w ago

When light enters a refracting medium, its speed changes due to the change in optical density, which causes the light waves to bend. If the light is entering the medium perpendicular to the surface, it will not bend, as there is no change in angle and no deviation occurs.

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Q: Why light passes undeviated falling straight on a refracting medium?
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When a ray light passes normally from one medium to another it gos undeviated?

Yes, when a ray of light passes normally from one medium to another (i.e., the incident angle is zero), it continues in a straight line undeviated. This is because there is no change in speed or direction at the interface between the two media.


Why a light ray falling perpendicular on a medium does not reflect?

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What is refracting index of a medium?

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Why pependicular refraction ray undeviated?

When a ray of light passes from one medium to another at a right angle (perpendicular incidence), it does not change direction or bend. This is because the refraction angle formula involves the sine of the angle of incidence, so when the angle of incidence is 0 degrees in perpendicular incidence, the sine of 0 is also 0. Therefore, the ray remains undeviated.


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Any change in the refractive index of the medium through which the light is travelling causes refraction of light.


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What will light do when passing through a single medium?

Light will continue in a straight line through the medium unless it encounters a boundary or a change in the medium's properties. It may be absorbed, reflected, or refracted depending on the characteristics of the medium.


When light travels from a denser medium to a rarer medium it bends away from the normal Is it possible for the light ray to reflect back in the same medium?

Yes, when light travels from a denser medium to a rarer medium and strikes the interface at an angle greater than the critical angle, total internal reflection can occur. In this case, the light ray reflects back into the denser medium instead of refracting into the rarer medium.


If light waves change speed as they pass from one medium into another at an angle the light will be?

If light waves change speed as they pass from one medium into another at an angle, the light will be refracted, meaning it will bend as it enters the new medium. This bending is due to the change in speed of the light wave.


What is refract the light?

Refracting light is when light waves pass through a medium such as air, water, or glass and change direction. This change in direction is caused by the change in speed of light as it moves from one medium to another. The amount of bending depends on the angle at which the light enters the new medium.