Wave Optics Test

Result

Wave Optics Test - 20

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Weekly Quiz Competition

Question 1
4 / -1

In a Young's double slit experiment, the separation between the two slits is 0.9 mm and the fringes are observed 1 m away. If it produces the second dark fringe at a distance of 1 mm from the central fringe, the wavelength of the monochromatic source of light used is

A
450 mm

B
400 mm

C
500 mm

D
600 mm
Question 2
4 / -1

In double slit experiment, the distance between two slits is 0.6 mm and these are illuminated with light of wavelength 4800Å. The angular width of first dark fringe on the screen distant 120 cm from slits will be

A
8 × 10^-4 rad

B
6 × 10^-4 rad

C
4 × 10^-4 rad

D
16 × 10^-4 rad
Question 3
4 / -1

In Young's double slit experiment, the slits are 3 mm apart. The wavelength of light used is 5000 A° and the distance between the slits and the screen is 90 cm. The fringe width in (mm) is

A
1.5

B
0.015

C
2.0

D
0.15

Solution
Question 4
4 / -1

In Young's double slit experiment intensity at a point is (1/4) of the maximum intensity. Angular position of this point is

A
sin (^-1 (λ/d)

B
sin (^-1 (λ/2d)

C
sin (^-1 (λ/3d)

D
sin (^-1 (λ/4d)

Solution
Question 5
4 / -1

The angular size of the central maxima due to a single slit diffraction is (a → slit width)

A

B

C

D
Question 6
4 / -1

Two stars are situated at a distance of 8 light year from the earth. These are to be just resolved by a telescope of diameter 0.25 m. If the wavelength of light used is 5000 Å, then the distance between the stars must be

A
3 × 10¹⁰ m

B
3.35 × 10¹¹ m

C
1.95 × 10¹¹ m

D
4.32 × 10¹⁰ m

Solution
Question 7
4 / -1

The angular resolution of a 10 cm diameter telescope at a wavelength of 5000 Å is of the order of

A
10⁶ rad

B
10^-2 rad

C
10^-4 rad

D
10^-6 rad

Solution
Question 8
4 / -1

A parallel beam of light of wavelength 6000 Å gets diffracted by a single slit of width 0.3 mm. The angular position of the first minima of diffracted light is

A
6 × 10^-3 rad

B
1.8 × 10^-3 rad

C
3 × 10^-3 rad

D
2 × 10^-3 rad

Solution
Question 9
4 / -1

Consider Fraunhofer diffraction pattern obtained with a single slit at normal incidence. At the angular position of first diffraction minimum, the phase difference between the wavelets from the opposite edges of the slit is

A

B

C
π

D
2π
Question 10
4 / -1

A parallel beam of fast moving electrons is incident normally on a narrow slit. A screen is placed at a large distance from the slit. If the speed of the electrons is increased, which of the following statement is correct?

A
Diffraction pattern is not observed on the screen in the case of electrons

B
The angular width of the central maximum of the diffraction pattern will increase

C
The angular width of the central maximum will decrease

D
The angular width of the central maximum will remains the same