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Wave opticsYDSEDiffraction Polaroids
Two waves having intensity in the ratio 25 : 4 produce interference. The ratio of the maximum to the minimum intensity is
A
B
D
C
5 : 2
7 : 3
49 : 9
9 : 49
Two waves having intensity in the ratio 25 : 4 produce interference. The ratio of the maximum to the minimum intensity is
A
B
D
C
5 : 2
7 : 3
49 : 9
9 : 49
In Young’s experiment, light of wavelength 4000 Å is used to produce bright fringes of width 0.6 mm, at a distance of 2 meters. If the whole apparatus is dipped in a liquid of refractive index 1.5, then fringe width will be
A
B
D
C
0.2 mm
0.3 mm
0.4 mm
1.2 mm
In Young’s experiment, light of wavelength 4000 Å is used to produce bright fringes of width 0.6 mm, at a distance of 2 meters. If the whole apparatus is dipped in a liquid of refractive index 1.5, then fringe width will be
A
B
D
C
0.2 mm
0.3 mm
0.4 mm
1.2 mm
In young’s double slit experiment, the fringe width is 1 ｘ10-4 m if the distance between the slit and screen is doubled and the distance between the two slit is reduced to half and wavelength is changed from 6.4 ｘ 10-7 m to 4.0 ｘ10-7 m, the value of new fringe width will be
A
B
D
C
0.15 ｘ 10-4 m
2.0 ｘ10-4 m
1.25 ｘ 10-4 m
2.5 ｘ 10-4 m
In young’s double slit experiment, the fringe width is 1 ｘ10-4 m if the distance between the slit and screen is doubled and the distance between the two slit is reduced to half and wavelength is changed from 6.4 ｘ 10-7 m to 4.0 ｘ10-7 m, the value of new fringe width will be
A
B
D
C
0.15 ｘ 10-4 m
2.0 ｘ10-4 m
1.25 ｘ 10-4 m
2.5 ｘ 10-4 m
In a Young’s double slit experiment, 12 fringes are observed to be formed in a certain segment of the screen when light of wavelength 600 nm is used. If the wavelength of light is changed to 400 nm, number of fringes observed in the same segment of the screen is given by
A
B
D
C
12
18
24
30
In a Young’s double slit experiment, 12 fringes are observed to be formed in a certain segment of the screen when light of wavelength 600 nm is used. If the wavelength of light is changed to 400 nm, number of fringes observed in the same segment of the screen is given by
A
B
D
C
12
18
24
30
The two slits at a distance of 1 mm are illuminated by the light of wavelength 6.5 ｘ10-7 m. The interference fringes are observed on a screen placed at a distance of 1m. The distance between third dark fringe and fifth bright fringe will be
A
B
D
C
0.65 mm
1.63 mm
3.25 mm
4.88 mm
The two slits at a distance of 1 mm are illuminated by the light of wavelength 6.5 ｘ10-7 m. The interference fringes are observed on a screen placed at a distance of 1m. The distance between third dark fringe and fifth bright fringe will be
A
B
D
C
0.65 mm
1.63 mm
3.25 mm
4.88 mm
A slit of size 0.15 cm is placed at 2.1 m from a screen. On illuminated it by a light of wavelength 5 ｘ10-7 cm. The width of central maxima will be
A
B
D
C
70 mm
0.14 mm
1.4 mm
0.14 cm
A slit of size 0.15 cm is placed at 2.1 m from a screen. On illuminated it by a light of wavelength 5 ｘ10-7 cm. The width of central maxima will be
A
B
D
C
70 mm
0.14 mm
1.4 mm
0.14 cm
A slit of width a is illuminated by white light. For red light (λ = 6500 Å), the first minimum is obtained at θ = 30o. Then the value of a will be
A
B
D
C
3250 Å
6.5 ｘ10-4 mm
1.3 microns
2.6 ｘ10-4 cm
A slit of width a is illuminated by white light. For red light (λ = 6500 Å), the first minimum is obtained at θ = 30o. Then the value of a will be
A
B
D
C
3250 Å
6.5 ｘ10-4 mm
1.3 microns
2.6 ｘ10-4 cm
Two polaroids are placed in the path of unpolarized beam of intensity I0 such that no light is emitted from the second polaroid. If a third polaroid whose polarization axis makes an angle θ with the polarization axis of the first polaroid, is placed between these polaroids then the intensity of light emerging from the last polaroid will be
A
B
D
C
Two polaroids are placed in the path of unpolarized beam of intensity I0 such that no light is emitted from the second polaroid. If a third polaroid whose polarization axis makes an angle θ with the polarization axis of the first polaroid, is placed between these polaroids then the intensity of light emerging from the last polaroid will be
A
B
D
C
Unpolarized light of intensity 32 Wm passes through three polarizers such that transmission axes of the first and second polarizer makes and angle 30o with each other and the transmission axis of the last polarizer is crossed with that of the first. The intensity of final emerging light will be
A
B
D
C
32 W/m2
3 W/m2
8 W/m2
4 W/m2
Unpolarized light of intensity 32 Wm passes through three polarizers such that transmission axes of the first and second polarizer makes and angle 30o with each other and the transmission axis of the last polarizer is crossed with that of the first. The intensity of final emerging light will be
A
B
D
C
32 W/m2
3 W/m2
8 W/m2
4 W/m2
A beam of natural light falls on a system of 6 polaroids, which are arranged in succession such that each polaroid is turned through 30o with respect to the preceding one. The percentage of incident intensity that passes through the system will be
A
B
D
C
100 %
50 %
30 %
12 %
A beam of natural light falls on a system of 6 polaroids, which are arranged in succession such that each polaroid is turned through 30o with respect to the preceding one. The percentage of incident intensity that passes through the system will be
A
B
D
C
100 %
50 %
30 %
12 %
Ray optics
What will be the height of image when an object of 2 mm is place on the axis of a convex mirror at a distance 20 cm of radius of curvature 40 cm
A
B
D
C
20 mm
10 mm
6 mm
1 mm
What will be the height of image when an object of 2 mm is place on the axis of a convex mirror at a distance 20 cm of radius of curvature 40 cm
A
B
D
C
20 mm
10 mm
6 mm
1 mm
When light enters from air to water, then its
A
B
D
C
Frequency increases and speed decreases
Frequency is same but the wavelength is smaller in water than in air
Frequency is same but the wavelength in water is greater than in air
Frequency decreases and wavelength is smaller in water than in air
When light enters from air to water, then its
A
B
D
C
Frequency increases and speed decreases
Frequency is same but the wavelength is smaller in water than in air
Frequency is same but the wavelength in water is greater than in air
Frequency decreases and wavelength is smaller in water than in air
Refractive index of glass is and refractive index of water is . If the speed of light in
glass is 2.00 ｘ 108 m/s, the speed in water will be
A
B
D
C
2.67 ｘ108 m/s
2.25 ｘ108 m/s
1.78 ｘ108 m/s
1.50 ｘ108 m/s
Refractive index of glass is and refractive index of water is . If the speed of light in
glass is 2.00 ｘ 108 m/s, the speed in water will be
A
B
D
C
2.67 ｘ108 m/s
2.25 ｘ108 m/s
1.78 ｘ108 m/s
1.50 ｘ108 m/s
On a glass plate a light wave is incident at an angle of 60o. If the reflected and the refracted waves are mutually perpendicular, the refractive index of material is
A
B
D
C
60o 60o
On a glass plate a light wave is incident at an angle of 60o. If the reflected and the refracted waves are mutually perpendicular, the refractive index of material is
A
B
D
C
The wavelength of light in two liquids ‘x’ and ‘y’ is 3500 Å and 7000 Å, then the critical angle of x relative to y will be
A
B
D
C
60°
45°
30°
15°
The wavelength of light in two liquids ‘x’ and ‘y’ is 3500 Å and 7000 Å, then the critical angle of x relative to y will be
A
B
D
C
60°
45°
30°
15°
A first looking from within water sees the outside world through a circular horizon. If the fish Is below the surface of water, what will be the radius of the circular horizon -(given μwater = 4/3)
A
B
D
C
3.0 cm
4.0 cm
4.5 cm
5.0 cm
A first looking from within water sees the outside world through a circular horizon. If the fish Is below the surface of water, what will be the radius of the circular horizon -(given μwater = 4/3)
A
B
D
C
3.0 cm
4.0 cm
4.5 cm
5.0 cm
A lens of power + 2 diopters is placed in contact with a lens of power -1 diopter. The combination will behave like
A
B
D
C
A converging lens of focal length 50 cm
A divergent lens of focal length 100 cm
A converging lens of focal length 100 cm
A converging lens of focal length 200 cm
A lens of power + 2 diopters is placed in contact with a lens of power -1 diopter. The combination will behave like
A
B
D
C
A converging lens of focal length 50 cm
A divergent lens of focal length 100 cm
A converging lens of focal length 100 cm
A converging lens of focal length 200 cm
The radius of curvature for a convex lens is 40 cm, for each surface. Its refractive index is 1.5. The focal length will be
A
B
D
C
40 cm
20 cm
80 cm
30 cm
The radius of curvature for a convex lens is 40 cm, for each surface. Its refractive index is 1.5. The focal length will be
A
B
D
C
40 cm
20 cm
80 cm
30 cm
A convex lens of focal length f is placed somewhere in between an object and a screen. The distance between the object and the screen is x. If the numerical value of the magnification produced by the lens is m, then the focal length of the lens is
A
B
D
C
A convex lens of focal length f is placed somewhere in between an object and a screen. The distance between the object and the screen is x. If the numerical value of the magnification produced by the lens is m, then the focal length of the lens is
A
B
D
C
If the refractive index of a material of equilateral prism is , then angle of minimum deviation of the prism is
A
B
D
C
30°
45°
60°
75°
A
B
D
C
30°
45°
60°
75°
If the refractive index of a material of equilateral prism is , then angle of minimum deviation of the prism is
Optical Instruments
If tube length of astronomical telescope is 105 cm and magnifying power is 20 for normal setting, calculate the focal length of objective
A
B
D
C
100 cm
10 cm
20 cm
25 cm
If tube length of astronomical telescope is 105 cm and magnifying power is 20 for normal setting, calculate the focal length of objective
A
B
D
C
100 cm
10 cm
20 cm
25 cm
A compound microscope has two lenses. The magnifying power of one is 5 and the combined magnifying power is 100. The magnifying power of the other lens is
A
B
D
C
10
20
50
25
A compound microscope has two lenses. The magnifying power of one is 5 and the combined magnifying power is 100. The magnifying power of the other lens is
A
B
D
C
10
20
50
25
An astronomical telescope has an angular magnification of magnitude 5 for distant objects. The separation between the objective and the eye piece is 36 cm and the final image is formed at infinity. The focal length fo of the objective and the focal length fe of the eye piece are
A
B
D
C
fo= 45 cm and fe = - 9 cm
fo = 7.2 cm and fe = 5 cm
fo = 50 cm and fe= 10 cm
fo = 30 cm and fe = 6 cm
An astronomical telescope has an angular magnification of magnitude 5 for distant objects. The separation between the objective and the eye piece is 36 cm and the final image is formed at infinity. The focal length fo of the objective and the focal length fe of the eye piece are
A
B
D
C
fo= 45 cm and fe = - 9 cm
fo = 7.2 cm and fe = 5 cm
fo = 50 cm and fe= 10 cm
fo = 30 cm and fe = 6 cm
The diameter of the objective of the telescope is 0.1 metre and wavelength of light is 6000 Å. Its resolving power would be approximately
A
B
D
C
7.32 ｘ10-6 rad
1.36 ｘ106 rad
7.32 ｘ10-5 rad
1.36 ｘ105 rad
The diameter of the objective of the telescope is 0.1 metre and wavelength of light is 6000 Å. Its resolving power would be approximately
A
B
D
C
7.32 ｘ10-6 rad
1.36 ｘ106 rad
7.32 ｘ10-5 rad
1.36 ｘ105 rad
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