Which instrument is used to detect path of visible rays?

Related Mcqs:

1. A body moving along the circumference of a circle completes two revolutions. If the radius of the circular path is R the ration of displacement to the covered path will be_____________?

   A. πR B. 2π R C. 0 D. 4πR...

2. Moving along the circumference of a circle completes two revolutions. If the radius of the circular path is R, the ratio of displacement to the covered path will be_______________?

   A. πR B. 2πR C. 0 D. 4πR...

3. If we look at the floating piece of iceberg on the sea, approximately what fraction of it is visible above the seawater level?

   A. 1/6th B. 1/8th C. 1/10th D. None of these Submitted by: Nayab Idrees...

4. What is wavelength of visible spectrum?

   A. 8500 – 9800 angstrom B. 7800 – 8000 angstrom C. 3900 – 7600 angstrom D. 1300 – 3000 angstrom Submitted by: Engr Allah Wadhayo...

5. A black body emitting all the radiation in the visible region appears________.

   A. Green B. White C. Blue D. Black Submitted by: Rizwan Ayub Saadi...

6. Wavelength of X-rays falling at glancing angle of 30? on a crystal with atmic spacing 2 x 10-10 for the fist order diffraction is________________?

   A. 4 x 10-10 m B. 2 x 10-10 m C. 0.02×10-10m D. 20×10-10m...

7. A lens which converges a beam of parallel rays to a point is called______________?

   A. diverging (or concave) lens B. converging (or convex) lens C. plano concave lens D. plano convex lens...

8. If a convex lens of large aperture fails to converge the light rays incident on it to a single point, it is said to suffer from______________?

   A. chromatic aberration B. spherical aberration C. both spherical and chromatic D. distortion...

9. A point where the incident parallel rays of light converge or appear to diverge after passing through a lens is called______________?

   A. center of curvature B. focus C. optical center D. aperture...

10. Hydrogen atom does not emit X-rays because _________________?

    A. its energy levels are too close to each other B. its energy levels are too far apart C. it is too small in size D. it has a single electron...