When light travels from a rarer to a denser medium, the speed decreases. Does this decrease in speed imply a decrease in the energy carried by the light wave? Justify your answer.
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Light enters from air into glass having refractive index 1.50. What is the speed of light in glass? The speed of light in vacuum is 3 x 108 ms-1.
Given,n=1.5 and the speed of light in vacuum, c = 3x 108 ms-1. We know that the refractive index is given by the expression n =c/v where c is the...
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What is an optically rarer medium?
A medium in which light travels comparatively faster than the other medium is called an optically rarer medium.
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What is an optically denser medium?
A medium in which light travels comparatively slower than the other medium is called an optically denser medium.
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If refractive indices of water and alcohol are 1.33 and 1.36 respectively, which of the two is optically denser medium?
The refractive index of alcohol is more than water, therefore, alcohol is optically denser medium.
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Why does a ray of light bend when it travels from one medium into another?
When a ray of light travels from one medium to another, its speed changes and this change in speed of light causes the bending of light (refraction of light).
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The speed of light depends (a) on elasticity of the medium only (b) on inertia of the medium only
(d) neither on elasticity nor on inertia. EXPLANATION: The light does not require even a medium. The speed of light in a medium is the intrinsic property of that medium which...
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Total internal reflection can take place only if (a) light goes from optically rarer medium (smaller refractive index) to optically denser medium
(b) light goes from optically denser medium to rarer medium EXPLANATION: When the light goes from a denser medium to lighter medium, it goes away from the normal. When the angle of...
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Total internal reflection can take place only if (a) light goes from optically rarer medium
(b) According to Snell’s Law, sin i/ sin r =μ 2/μ 1 = where r = 90º for particular incidence angle called critical angle. When the incidence angle is equal to or greater than...
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A car travels a distance of 75 km at the speed of 25km/ hr. It covers the next 25 km of its journey at the speed of 5 km/hr and the last 50 km
(c) Time taken to cover first 75 km of distance =75/25 =3 hours Time taken to cover next 25 km of distance =25/5 =5 hours Time taken to cover last 50 km of its journey =50/25...
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A car travels a distance of 45 kms at the speed of 15 kmph. It covers the next 50 kms of its journey at the speed
(e) Time taken to cover a distance of 45 kms =45/15 = 3 hours Time taken to cover a distance of 50 kms =50/25 = 2 hours Time taken to cover distance of 25...
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