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General

General

Easy

Question

During refraction through a glass slab, when the medium at the both sides of the glass slab is the same then, the incident ray is parallel to ____.

Refracted ray
Emergent ray
Normal line
None of the above

hint Hint:

Parallel to each other

The correct answer is: Emergent ray

On both the parallel sides of the glass slab, the change in direction of light ray is equal but in opposite directions.

Thus, the light ray emerging from the glass slab is parallel to the incident ray.

So, the correct option is b.

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A body is orbiting very close to the earth’s surface with kinetic energy KE. The energy required to completely escape from it is

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The value of k, for which $left parenthesis cos invisible function application x plus sin invisible function application x right parenthesis to the power of 2 end exponent plus k sin invisible function application x cos invisible function application x minus 1 equals 0$ is an identity, is

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