• 3°3\degree3°
• 5°5\degree5°
• 7°7\degree7°
• 9°9\degree9°
• #### 2.  Total internal reflection only occurs when light tries to travels from a medium with a _____ index to ____ index

• lower to higher
• higher to lower
• same to same

• True
• False

• 0.2 m/s
• 5 m/s
• 12 m/s
• 20 m/s
• #### 5.  What must be true about waves which reflect off of fixed boundaries?

• Their amplitude increases.
• Their wavelength increases.
• They become inverted.
• They remain erect.
• #### 6.  If a wave from one slit of a Young's double-slit experiment set-up arrives at a point on the screen one wavelength behind the wave from the other slit, what is observed at that point?

• dark fringe
• bright fringe
• multi-colored fringe
• gray fringe, neither bright nor dark
• #### 7.  When light travels from air into another medium with a higher index of refraction, what happens to the speed at which it travels.

• it increases
• it decreases
• it remains constant
• this is impossible
• #### 8.  ______________________ occurs when waves combine to create a wave with a LOWER amplitude.

• Diffraction
• Constructive interference
• Destructive interference
• Refraction
• #### 9.  For diffraction at a single Slit, the angular position for nth secondary maxima is

• θ=nλ\theta=n\lambdaθ=nλ
• θ= nλa\theta=\ \frac{n\lambda}{a}θ= anλ​
• θ= (n+12)λa\theta=\ \left(n+\frac{1}{2}\right)\frac{\lambda}{a}θ= (n+21​)aλ​
• θ= naλ\theta=\ \frac{na}{\lambda}θ= λna​

• polarization
• diffraction
• refraction
• interference

• cylindrical
• plane
• spherical
• parabolic
• #### 12.  As per Huygens principle, wavelets originating on a wavefront grow with

• slow speed
• same speed
• more speed
• none of these

• dispersion
• diffraction
• interference
• polarization
• #### 14.  In youngs double slit experiment if entire apparatus is immersed in water the fridge width would

• decrease
• increase
• not change
• none of the above
• #### 15.  If on rotating an analyser there no variation in the intensity of light then the light is

• plane polarized
• unpolarized
• partially polarized
• extra ordinary

• frequency
• amplitude
• period
• crest
• #### 17.  The dual nature of light is exhibited?

• diffraction and photoelectric effect
• photoelectric effect
• refraction & interference
• diffraction & reflection

• interference
• diffraction
• polarization
• dispersion
• #### 19.  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)
• #### 20.  What is path difference for destructive interference?

• (a) nλ
• (b) n(λ +1)
• (c) (2n + 1)λ/2
• (d) (n +1)λ/2
• #### 21.  Which of the following phenomenon is not explained by Huygen’s wave theory?

• Diffraction
• Interference
• Polarisation
• Photoelectric effect
• #### 22.  For diffraction at a single Slit, the angular position for nth minimum is

• θ=nλ\theta=n\lambdaθ=nλ
• θ= nλa\theta=\ \frac{n\lambda}{a}θ= anλ​
• θ= (n+12)λa\theta=\ \left(n+\frac{1}{2}\right)\frac{\lambda}{a}θ= (n+21​)aλ​
• θ= naλ\theta=\ \frac{na}{\lambda}θ= λna​
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