روشنی _____ میں تیز ترین سفر کرتی ہے؟
-
A. Water
-
B. None of these
-
C. Air
-
D. Vacuum
Explanation
The speed of light traveling through a vacuum is exactly 299,792,458 meters (983,571,056 feet) per second. That's about 186,282 miles per second.
A universal constant is known in equations as "c," or light speed.
The speed of light in air is 2.9 × 10⁸ m/s.
-
A. 0∘
-
B. 90∘
-
C. 45∘
-
D. 180∘
Explanation
A ray of light represents the direction of propagation of the wave.
A wavefront is a surface over which the phase of the wave is constant.
Rays are always perpendicular to the wavefronts.
Angle between ray and wavefront=90∘
کل داخلی عکاسی کا رجحان واقعات کے زاویہ کے لئے مشاہدہ کیا جاتا ہے؟
-
A. Greater than critical angle
-
B. Equal to critical angle
-
C. Less than critical angle
-
D. None of these
Explanation
Total internal reflection occurs when light travels from a denser to a rarer medium, and the angle of incidence exceeds the critical angle.
At this point, light is completely reflected back into the denser medium.
✅ Correct: 0 |
❌ Wrong: 0 |
📊 Total Attempted: 0
iamge
