- Home
- General Science
Physics -- Optics
21.
In a Young’s double-slit experiment, the central bright fringe can
be identified
- A.as it has greater intensity than the other bright fringes
- B.as it is wider than the other bright fringes
- C.as it is narrower than the other bright fringes
- D.by using white light instead of monochromatic light
- Answer
- Report
Answer : [D]
22.
In a Young’s double-slit experiment, if the slits are of unequal
width,
- A.fringes will not be formed
- B.the positions of minimum intensity will not be completely dark
- C.bright fringe will not be formed at the centre of the screen
- D.distance between two consecutive bright fringes will not be equal to the distance between two consecutive dark fringes
- Answer
- Report
Answer : [B]
23.
A bird flies down vertically towards a water surface. To a fish
inside the water, vertically below the bird, the bird will appear to (Choose Multiple Answers)
- A.be farther away than its actual distance
- B.be closer than its actual distance
- C.move faster than its actual speed
- D.move slower than its actual speed
- Answer
- Report
Answer : [A,C]
24.
A swimmer S inside water is vertically above a fixed point P. A
rectangular glass slab B is placed between S and P. As seen by S,
the position of P will appear to change, if
- A.B is moved horizontally
- B.B is moved vertically
- C.S moves horizontally
- D.S moves vertically
- Answer
- Report
Answer : [C]
25.
A ray of light travelling in a transparent medium falls on a
surface separating the medium from air, at an angle of incidence
of 45o. The ray undergoes total internal reflection. If n is the
refractive index of the medium with respect to air, select the
possible values of n from the following. (Choose Multiple Answers)
- A.1.3
- B.1.4
- C.1.5
- D.1.6
- Answer
- Report
Answer : [C,D]
|
|
||||||||||||||||||||||||||||
