GK
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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passes straight through as if the glass were not there.
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leaves the glass at a smaller angle to the normal.
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leaves the glass at a larger angle to the normal.
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leaves with the same angle to the normal, but is deflected to the side.
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Detailed explanation-1: -If a ray of light strikes a plane of glass at 45 degrees to the normal after reflection it reflects with the angle of 45⁰ again. Reflection:-When the light ray falls on the smooth, rough or polished surface it bounces back with the same angle equal to the angle of incident light.
Detailed explanation-2: -A ray of light strikes a plane mirror at an angle of incidence 45o as shown in fig. 1.364. After reflection, the ray passes through a prism of refractive index 1.5 whose apex angle is 4o. If the mirror be rotated by X degrees then the total deviation of the ray becomes 90o.
Detailed explanation-3: -Hence angle of incidence =900−500=400.
Detailed explanation-4: -Solution. A ray of light strikes the glass slab at an angle 40° with the surface of the slab. Then the angle of incidence will be 50°.
Detailed explanation-5: -A ray of light strikes a plane mirror at an angle of 40° to the mirror surface. What will be the angle of reflection? Now, we know that according to the law of reflection, the angle of incidence is equal to the angle of reflection. Therefore, the angle of reflection will be 50°.