The distance of the moon from earth is 3.8×105 km. The eye is most sensitive to light of

wavelength 5500 Å. The minimum separation between two points on the moon that can

be resolved by a 500 cm telescope will be 

1. 51 m                         

2. 60 m

3. 70 m                         

4. All the above

Subtopic:  Resolving Power of Optical Devices (OLD NCERT) |
 63%
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A light source is located at P1 as shown in the figure. All sides of the polygon are equal. The intensity of illumination at P2 is I0 . What will be the intensity of illumination at P3?

                           

1. 34I0                                   

2. I08

3. 38I0                                       

4. 38I0

Subtopic:  Superposition Principle |
From NCERT
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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 resolve 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) |
 61%
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) |
 69%
From NCERT
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Two point white dots are 1mm apart on a black paper. They are viewed by eye of pupil

diameter 3 mm. Approximately, what is the maximum distance at which dots can be

resolved by the eye ? [Take wavelength of light = 500 nm]

1. 6 m                           

2. 3 m

3. 5 m                           

4. 1 m

Subtopic:  Resolving Power of Optical Devices (OLD NCERT) |
 54%
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) |
 85%
From NCERT
NEET - 2017
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Young's double-slit experiment is first performed in air and then in a medium other than air. It is found that 8th bright fringe in the medium lies where 5th dark fringe lies in the air. The refractive index of the medium is nearly 

(1)1.25 

(2) 1.59 

(3) 1.69

(4) 1.78 

Subtopic:  Young's Double Slit Experiment |
 54%
NEET - 2017
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Two polaroids P1 and P2 are placed with their axis perpendicular to each other. Unpolarised light Io is incident on P1. A third polaroid P3 is kept in between P1 and P2 such that its axis makes an angle 45° with that of P1. The intensity of transmitted light through P2

(a)Io2

(b) Io4

(c) Io8

(d) Io16

Subtopic:  Polarization of Light |
 59%
From NCERT
NEET - 2017
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The intensity at the maximum in Young's double-slit experiment is I0 when the distance between two slits is d=5λ, where λ is the wavelength of light used in the experiment. What will be the intensity in front of one of the slits on the screen placed at a distance D= 10 d?

(1) I04               

(2) 34I0

(3) I02             

(4) I0

Subtopic:  Young's Double Slit Experiment |
 54%
NEET - 2016
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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 at an angle of 

(a) sin-123           (b) sin-112

(c) sin-134           (d) sin-114

Subtopic:  Diffraction |
 64%
From NCERT
NEET - 2016
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