Q.1
The angle of incidence at which reflected light is totally polarised for reflection from air to glass ( refractive index n)
  • sin-1 (n)
  • sin-1 (1 / n)
  • tan-1 (1 / n)
  • tan-1 (n)
Q.2
An unpolarised beam of intensity I0 is incident on a pair of nicols making anglewith each other. The intensity of light emerging from the pair is :
  • I0
  • I0 / 2
  • I0 / 4
  • I0 / 8
Q.3
What does not change on polarisation of light ?
  • Intensity
  • Phase
  • Frequency
  • Wavelength
Q.4
On passing a plane wavefront through a concave lens, we get a
  • plane wavefront
  • spherical wavefront
  • cylindrical wavefront
  • parabolic wavefront
Q.5
A point source of light creates..... ........... wavefront
  • cylindrical
  • plane
  • spherical
  • parabolic
Q.6
Tan(p) = n is known as
  • malus law
  • Rayleigh law
  • huygens law
  • brewesters law
Q.7
Coherent sources have same
  • frequency
  • wavelength
  • phase
  • all the above
Q.8
In single slit diffraction experiment, on moving sreen away from the slit angular width of fringes would
  • decrease
  • increase
  • no change
  • none of these
Q.9
In youngs double slit experiment a path difference ofwavelength at a point would give ........... fringe
  • dark
  • bright 🔆
  • more wide
  • none of these
Q.10
As per Huygens principle, wavelets originating on a wavefront grow with
  • slow speed
  • same speed
  • more speed
  • none of these
Q.11
Superposition of family of waves originating from a slit forms......... pattern
  • interference
  • diffraction
  • polarization
  • dispersion
Q.12
Concave lenses or diverging lenses, always produce images that are .....
  • Virtual, upright, smaller
  • Real, inverted, larger
  • Real, inverted, smaller
  • Virtual, upright, larger
Q.13
Using the fact that light travels at 3.0xm/s find the frequency of yellow light. (wavelength of yellow light is 5.x 10-7 m)
  • 5.12 x 1014 Hz
  • 176 Hz
  • 0.14 Hz
  • 3 x 108 Hz
Q.14
Calculate the frequency of green light in a vacuum with a wavelength of 5.x-m and a speed (c) of 3.x 108?
  • 5.66 × 1014 Hz
  • 5.17 × 1014 Hz
  • 6 × 1016 Hz
  • a lot?
Q.15
Solve this problems using the equation: c = λν Calculate the wavelength of light that has a frequency of 5.2 x 1012/s. The speed of of light is 3.xm/s.
  • 5.8 x 10 -5 m
  • 5.8 x 10 -7 m
  • 5.19 x 10 14 m
  • 1.56 x 10 23 m
Q.16
A microwave oven emits a light wave at a wavelength of 0.m. What is the frequency of this radiation?
  • 6.67 x 10-7 Hz
  • 2.00 Hz
  • 1.50 x 106 Hz
  • 6.00 x 1010 Hz
Q.17
If the velocity of light in a medium depends on its frequency, the medium is said to be
  • refractive
  • resonant
  • diffractive
  • dispersive
Q.18
Calculate the wavelength of light that has a frequency of 5.2 xHz.
  • 5.8 x 10 -5 m
  • 5.8 x 10 -7 m
  • 5.19 x 10 14 m
  • 1.56 x 10 23 m
Q.19
The ratio of intensity of Maxima and Minima for the in the interference of two waves with amplitude a_1a and a2 a_{}a2 ​ is
  • (a1+a2)(a1−a2)\frac{\left(a_1+a_2\right)}{\left(a_1-a_2\right)}(a1​−a2​)(a1​+a2​)​
  • (a1−a2)(a1+a2)\frac{\left(a_1-a_2\right)}{\left(a_1+a_2\right)}(a1​+a2​)(a1​−a2​)​
  • (a1+a2)2(a1−a2)2\frac{\left(a_1+a_2\right)^2}{\left(a_1-a_2\right)^2}(a1​−a2​)2(a1​+a2​)2​
  • (a1−a2)2(a1+a2)2\frac{\left(a_1-a_2\right)^2}{\left(a_1+a_2\right)^2}(a1​+a2​)2(a1​−a2​)2​
Q.20
When you go out to sun, ultraviolet light rays give you your tan. What is the wavelength of this light if it has a frequency of7.XHz?
  • 3.88 x 10-7 m
  • 3.26 x 10-2 m
  • 2.58 x 106 m
  • 2.32 x 1023 m
0 h : 0 m : 1 s