The average distance between the earth and moon is 38.6×104 km. The minimum separation between the two points on the surface of the moon that can be resolved by a telescope whose objective lens has a diameter of 5 m with λ=6000Α is 

(1) 5.65 m                    

(2) 28.25 m

(3) 11.30 m                   

(4) 56.51 m

Subtopic:  Resolving Power of Optical Devices (OLD NCERT) |
 63%
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We wish to see inside an atom. Assuming the atom to have a diameter of 100 pm, this means that one must be able to resolved a width of say 10 p.m. If an electron microscope is used, the minimum electron energy required is about

(1) 1.5 KeV                         

(2) 15 KeV

(3) 150 KeV                       

(4) 1.5 KeV

Subtopic:  Resolving Power of Optical Devices (OLD NCERT) |
 63%
From NCERT
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A telescope has an objective lens of 10 cm diameter and is situated at a distance of one kilometre from two objects. The minimum distance between these two objects, which can be resolved by the telescope, when the mean wavelength of light is 5000 Å, is of the order of 

(1) 0.5 m                        

(2) 5 m

(3) 5 mm                       

(4) 5 cm

Subtopic:  Resolving Power of Optical Devices (OLD NCERT) |
 72%
From NCERT
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The ratio of resolving powers of an optical microscope for two wavelengths λ1=4000 A o and λ2=6000 Ao is:

1. 8:27

2. 9:4

3. 3:2

4. 16:81

Subtopic:  Resolving Power of Optical Devices (OLD NCERT) |
 91%
From NCERT
NEET - 2017
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In a diffraction pattern due to a single slit of width a,the first minimum is observed at an angle 30 when light of wavelength 5000 A˙ is incident on the slit. The first secondary maximum is observed is an angle of 

(1) sin-123

(2) sin-112

(3) sin-134

(4) sin-114

Subtopic:  Diffraction |
 72%
From NCERT
NEET - 2016
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At the first minimum adjacent to the central maximum of a single slit diffraction pattern, the phase difference between the Huygen's wavelet from the edge of the slit and the wavelet from the midpoint of the slit is

(1) π/4 radian

(2) π/2 radian

(3) π radian

(4) π/8 radian

Subtopic:  Diffraction |
 59%
From NCERT
NEET - 2015
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A thin mica sheet of thickness 2×10–6 m and refractive index (μ = 1.5) is introduced in the path of the first wave. The wavelength of the wave used is 5000 Å. The central bright maximum will shift 

(1) 2 fringes upward

(2) 2 fringes downward

(3) 10 fringes upward

(4) None of these

Subtopic:  Young's Double Slit Experiment |
 70%
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In Young's double slit experiment, the distance between the two slits is 0.1 mm and the wavelength of light used is 4×10–7 m. If the width of the fringe on the screen is 4 mm, the distance between screen and slit is 

(1) 0.1 mm

(2) 1 cm

(3) 0.1 cm

(4) 1 m

Subtopic:  Young's Double Slit Experiment |
 82%
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In Young’s experiment, the distance between slits is 0.28 mm and distance between slits and screen is 1.4 m. Distance between central bright fringe and third bright fringe is 0.9 cm. What is the wavelength of used light 

(1) 5000 Å

(2) 6000 Å

(3) 7000 Å

(4) 9000 Å

Subtopic:  Young's Double Slit Experiment |
 67%
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If a transparent medium of refractive index μ = 1.5 and thickness t = 2.5 × 10–5 m is inserted in front of one of the slits of Young’s Double Slit experiment, how much will be the shift in the interference pattern? The distance between the slits is 0.5 mm and that between slits and screen is 100 cm 

(1) 5 cm

(2) 2.5 cm

(3) 0.25 cm

(4) 0.1 cm

Subtopic:  Young's Double Slit Experiment |
 80%
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