Engineering Physics II Practice Test 2

1. The refractive index of a parallel glass slab is 1.57. A light, from medium Y, is incident on the glass slab. If the angle of incidence is 37°, then the angle of emergence, when the light emerges back to medium Y, is ____

37°

54°

60°

45°

2. A screen is placed 2m away from the lens to obtain the diffraction pattern in the focal plane of the lens in a single slit diffraction experiment. What will be the slit width if the first minimum lies 5 mm on either side of the central maximum when plane light waves of wavelength 4000 Å are incident on the slit?

0.46 mm

0.26 mm

0.36 mm

0.16 mm

3. In Newton’s ring experiment, the diameter of the 10^th ring changes from 1.40 to 1.23 cm when a liquid is introduced between the lens and glass plate. What is the refractive index of the liquid?

1.15

1.05

1.35

1.25

4. How are these two images resolved?

Well resolved

Just Resolved

Partially resolved

Not resolved

5. What kind of sources are required for Young’s Double Slit experiment?

Intense

Bright

Incoherent

Coherent

6. How many lenses are used in Fresnel Diffraction?

One Convex lens

Two Concave lenses

Two Convex lenses

No lens used

7. The following pattern is observed for which experiment?
$engineering-physics-questions-answers-fraunhofer-diffraction-q8$

Fabry-Perot Interferometer

Double Slit Fraunhofer Diffraction

Single Slit Fraunhofer Diffraction

Fresnel Diffraction

8. Zero order fringe can be identified using ____________

Yellow light

Achromatic light

White light

Monochromatic light

9. What change is observed when the whole pattern is immersed in water?

The bright and dark fringes will change position

Colored fringes

Fringe width decreases

Fringe width increases

10. A light is incident on a glass slab. The angle of incidence is 54° while the angle of refraction is 30°. What will be the speed of light in the glass slab?

v = 1.85 X 10⁸m/s

v = 3.85 X 10⁸m/s

v = 4.85 X 10⁸m/s

v = 2.85 X 10⁸m/s