If the 5th order maxima of wavelength 4000 Ao in Young's double-slit experiment coincides with the nth order maxima of wavelength 5000 Ao, then n is equal to:

1.  5

2.  8

3.  4

4.  10

Subtopic:  Young's Double Slit Experiment |
 86%
From NCERT
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Light of wavelength 6000 Ao in air enters a medium of refractive index 1.5. Frequency and wavelength of light in the medium respectively are 

1.  5 ×1014 Hz, 6000 Ao

2.  5 ×1014 Hz, 4000 Ao

3.  103 ×1014 Hz, 4000 Ao

4.  103 ×1014 Hz, 6000 Ao

Subtopic:  Superposition Principle |
 78%
From NCERT
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The ratio of angular width of principal maximum to the angular width of the secondary maximum in single slit diffraction is

1.  4 : 1

2.  2 : 1

3.  5 : 1

4.  3 : 1

Subtopic:  Diffraction |
 69%
From NCERT
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The resolving power of a microscope can be increased by using:

1.  red light.
2.  blue light.
3.  oil between objective lens and object.
4.  both (2) and (3).

Subtopic:  Resolving Power of Optical Devices (OLD NCERT) |
 67%
From NCERT
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Monochromatic light of a wavelength λ in air is refracted into a glass slab of refractive index μ. The wavelength of light in the glass is

1.  λ

2.  μλ

3.  λμ

4.  λμ2

Subtopic:  Superposition Principle |
 83%
From NCERT
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Two coherent sources are 0.3 mm apart. They are 1 m away from the screen. The second dark fringe is at a distance of 0.3 cm from the center. The distance of the fourth bright from the centre is

1.  0.16 cm

2.  1.6 cm

3.  0.8 cm

4.  8 cm

Subtopic:  Young's Double Slit Experiment |
 77%
From NCERT
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Assume that light of wavelength 7000 Ao is coming from a star. The limit of resolution (in radian) of a telescope whose objective has a diameter of 244 cm, will be

1.  2.5 × 10-7

2.  5.0 × 10-7

3.  3.5 × 10-7

4.  4.5 × 10-7

Subtopic:  Resolving Power of Optical Devices (OLD NCERT) |
 75%
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Light of wavelength 5000 Ao travelling at a speed of 2 ×108 m/s in medium 1 is incident on a boundary and gets refracted into medium 2. Its wavelength after refraction is found to be 5500 Ao. Which of the following is incorrect?

1.  Refractive index of medium 2 is 1110.

2.  On entering medium 2, light bends away from normal.

3.  Speed of light is more in medium 2 than in medium 1.

4.  Its frequency remains unchanged.

Subtopic:  Superposition Principle |
 62%
From NCERT
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Yellow light is used in a single slit diffraction pattern with a slit width of 0.5 mm. If the yellow light is replaced by X-rays, then the observed pattern will reveal

1.  No diffraction pattern

2.  More narrow central maximum

3.  More number of fringes

4.  Less number of fringes

Subtopic:  Diffraction |
From NCERT
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In Young's double hole (slit) experiment using the light of wavelength 6000 Ao, the angular width of the fringe formed on a distant screen is 0.1°. The slit separation is approximate:

1.  0.34 mm

2.  0.34 cm

3.  0.34 m

4.  0.034 mm

Subtopic:  Young's Double Slit Experiment |
 61%
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