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%
From NCERT
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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%
From NCERT
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Intensity at the centre in YDSE is I0. If one of the slits is covered then, the intensity at the centre will be 

1.  I0

2.  2I0

3.  I0/4

4.  I0/2

Subtopic:  Superposition Principle |
 64%
From NCERT
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A diffraction pattern is obtained by using a beam of red light. What will happen, if the red light is replaced by blue light?

1.  Bands will become narrower

2.  Bands become broader

3.  No change will take place

4.  Bands disappear

 

Subtopic:  Diffraction |
 79%
From NCERT
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When a thin transparent plate of thickness t and refractive index μ is placed in the path of one of the two interfering waves of light, then the extra path difference created between two waves due to the plate is

1.  μ + 1t

2.  μ - 1t

3.  μ+1t

4.  μt

Subtopic:  Superposition Principle |
 83%
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