BITSAT Physics Wave Optics MCQs

Refer to BITSAT Physics Wave Optics MCQs provided below. BITSAT Full Syllabus Physics MCQs with answers available in Pdf for free download. The MCQ Questions for Full Syllabus Physics with answers have been prepared as per the latest syllabus, BITSAT books and examination pattern suggested in Full Syllabus by BITSAT, NCERT and KVS. Multiple Choice Questions for Wave Optics are an important part of exams for Full Syllabus Physics and if practiced properly can help you to get higher marks. Refer to more Chapter-wise MCQs for BITSAT Full Syllabus Physics and also download more latest study material for all subjects

MCQ for Full Syllabus Physics Wave Optics

Full Syllabus Physics students should refer to the following multiple-choice questions with answers for Wave Optics in Full Syllabus. These MCQ questions with answers for Full Syllabus Physics will come in exams and help you to score good marks

Wave Optics MCQ Questions Full Syllabus Physics with Answers

 

Question: A telescope has an objective lens of 10 cm diameter and is situated at a distance of one kilometer 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

  • a) 5 cm
  • b) 0.5 m
  • c) 5 m
  • d) 5 mm

Answer: 5 mm


Question: There are two sources kept at distances 2 λ. A large screen is perpendicular to line joining the sources. Number of maximas on the screen in this case is (λ = wavelength of light)

BITSAT Physics Wave Optics 1

  • a) 1
  • b) 3
  • c) 5
  • d) 7

Answer: 3

 

Question: In the Young’s double-slit experiment, the intensity of light at a point on the screen where the path difference is λ is K, (λ being the wave length of light used). The intensity at a point where the path difference is l/4, will be :[

  • a) K
  • b) K/4
  • c) K/2
  • d) Zero

Answer: K/2


Question: A ray of light of intensity I is incident on a parallel glass slab at point A as shown in diagram. It undergoes partial reflection and refraction. At each reflection, 25% of incident energy is reflected. The rays AB and A'B' undergo interference. The ratio of Imax and Imin is :

BITSAT Physics Wave Optics 2

  • a) 49 : 1
  • b) 7 : 1
  • c) 4 : 1
  • d) 8 : 1

Answer: 49 : 1


Question: Calculate the wavelength of light used in an interference experiment from the following data : Fringe width = 0.03 cm. Distance between the slits and eyepiece through which the interference pattern is observed is 1m. Distance between the images of the virtual source when a convex lens of focal length 16 cm is used at a distance of 80 cm from the eyepiece is 0.8 cm.

  • a) 0.0006 Å
  • b) 0.0006 m
  • c) 600 cm
  • d) 6000 Å

Answer: 6000 Å


Question: In a YDSE, the light of wavelength l = 5000 Å is used, which emerges in phase from two slits a distance d = 3 × 10–7m apart. A transparent sheet of thickness t = 1.5 × 10–7m refractive index μ = 1.17 is placed over one of the slits. what is the new angular position of the central maxima of the interference pattern, from the centre of the screen? Find the value of y.

BITSAT Physics Wave Optics 3

  • a)

    BITSAT Physics Wave Optics 4

  • b)

    BITSAT Physics Wave Optics 5

  • c)

    BITSAT Physics Wave Optics 6

  • d)

    BITSAT Physics Wave Optics 7

Answer:

BITSAT Physics Wave Optics 5

 

Question: A parallel beam of monochromatic light is incident on a narrow rectangular slit of width 1mm. When the diffraction pattern is seen on a screen placed at a distance of 2m. the width of principal maxima is found to be 2.5 mm. The wave length of light is-

  • a) 6250 Å
  • b) 6200 Å
  • c) 5890 Å
  • d) 6000 Å

Answer: 6250 Å


Question: In Young's double slit experiment 10th order maximum is obtained at the point of observation in the interference pattern for λ = 7000 Å. If the source is replaced by another one of wavelength 5000 Å then the order of maximum at the same point will be –

  • a) 12 th
  • b) 14 th
  • c) 16 th
  • d) 18 th

Answer: 14 th


Question: Young’s double slit experiment is carried out by using green, red and blue light, one color at a time. The fringe widths recorded are βG, βR and βB, respectively. Then

  • a) βG > βB > βR
  • b) βB > βG > βR
  • c) βR > βB > βG
  • d) βR > βG > βB

Answer: βR > βG > βB

 

Question: A single slit diffraction pattern is obtained using a beam of red light. If the red light is replaced by the blue light, then the diffraction pattern

  • a) Remains unchanged
  • b) Becomes narrower
  • c) Becomes broader
  • d) Will disappear

Answer: Becomes narrower

 

Question: In a Young’s double slit experiment the angular width of a fringe formed on a distant screen is 1°. The wavelength fo the light used is 6280 Å. What is the distance between the two coherent sources ?

  • a) 0.036 mm
  • b) 0.12 mm
  • c) 6 mm
  • d) 4 mm

Answer: 0.036 mm

 

Question: If the distance between the first maximum and fifth minimum of a double slit pattern is 7mm and the slits are separated by 0.15 mm with the screen 50 cm. from the slits, then find the wavelength of the light used.

  • a) 200 mm
  • b) 100 mm
  • c) 800 mm
  • d) 600 mm

Answer: 600 mm


Question: The diameter of the objective of a telescope is a, its magnifying power is m and wavelength of light is λ, The resolving power of the telescope is:

  • a) (1.22λ)/ a 
  • b) (1.22 a)/ λ
  • c) λm / (1.22 a)
  • d) a /(1.22 λ

Answer: a /(1.22 λ

 

Question: When a mica sheet of thickness 7 microns and m = 1.6 is placed in the path of one of interfering beams in the biprism experiment then the central fringe gets at the position of seventh bright fringe. The wavelength of light used will be

  • a) 4000 Å
  • b) 5000 Å
  • c) 6000 Å
  • d) 7000 Å

Answer: 6000 Å


Question: In Young's double slit experiment, if the slit widths are in the ratio 1 : 2, the ratio of the intensities at minimum and maximum will be

  • a) 1 : 2
  • b) 1 : 3
  • c) 1 : 4
  • d) 1 : 9

Answer: 1 : 9


Question: When the angle of incidence is 60° on the surface of a glass slab, it is found that the reflected ray is completely polarised. The velocity of light in glass is

  • a) √2 ×108ms-1
  • b) √3 ×108ms-1
  • c) 2 ×108ms-1
  • d) 3×108ms-1

Answer: √3 ×108ms-1

 

Question: In a Young's experiment, the separation between the slits is 0.10mm, the wavelength of light used is 600nm and the interference pattern is observed on a screen 1.0 m away. Find the separation between the successive bright fringes

  • a) 6.6 mm
  • b) 6.0 mm
  • c) 6 m
  • d) 6 cm

Answer: 6.0 mm


Question: The two coherent sources of intensity that ratio 2 : 8 produce an interference pattern. The values of maximum and minimum intensities will be respectively. Where I1 is the intensity of first source

  • a) I1 and 9 I1
  • b) 9I1 and I1
  • c) 2I1 and 8I1
  • d) 8I1 and 2I1

Answer: 9I1 and I1

 

Question: The first diffraction minima due to a single slit diffraction is at θ =30° for a light of wavelength 5000 Å. The width of the slit is –

  • a) 5 × 10–5 cm. 
  • b) 10 × 10–5 cm.
  • c) 2.5 × 10–5 cm.
  • d) 1.25 × 105 cm

Answer: 10 × 10–5 cm.

 

Question: The numerical aperture of a microscope is 0.12, and the wavelength of light used is 600 nm. Then its limit of resolution will be nearly –

  • a) 0.3 μm
  • b) 1.2 μm
  • c) 2.3 μm
  • d) 3.0 μm

Answer: 3.0 μm

 

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BITSAT Full Syllabus Physics Wave Optics MCQs

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Wave Optics BITSAT Full Syllabus MCQs Physics

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BITSAT MCQs Physics Full Syllabus Wave Optics

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