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