Wave Optics Practice Test — Class 12 Physics

12th Standard Physics — Wave Optics: Online Practice Test

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A plane glass is placed over a various coloured letters (violet, green, yellow, red) The letter which appears to be raised more is,

A.red B.yellow C.green D.violet

Two point white dots are 1 mm apart on a black paper. They are viewed by eye of pupil diameter 3 mm approximately. The maximum distance at which these dots can be resolved by the eye is, [take wavelength of light, \(\lambda\) = 500 nm]

A.1 m B.5 m C.3 m D.6 m

In a Young’s double-slit experiment, the slit separation is doubled. To maintain the same fringe spacing on the screen, the screen-to-slit distance D must be changed to,

A.2D B.D/2 C.\(\sqrt{2}\)D D.D/\(\sqrt{2}\)

Two coherent monochromatic light beams of intensities I and 4I are superposed. The maximum and minimum possible intensities in the resulting beam are

A.5I and I B.5I and 3I C.9I and I D.9I and 3I

When light is incident on a soap film of thickness 5\(\times\)10\(^{–5}\) cm, the wavelength of light reflected maximum in the visible region is 5320 Å. Refractive index of the film will be,

A.1.22 B.1.33 C.1.51 D.1.83

First diffraction minimum due to a single slit of width 1.0\(\times\)10\(^{–5}\) cm is at 30\(^{o}\). Then wavelength of light used is,

A.400 Å B.500 Å C.600 Å D.700 Å

A ray of light strikes a glass plate at an angle 60\(^{o}\). If the reflected and refracted rays are perpendicular to each other, the refractive index of the glass is,

A.\(\sqrt{3}\) B.\(\frac{\sqrt{3}}{2}\) C.\(\frac{3}{2}\) D.2

One of the of Young’s double slits is covered with a glass plate as shown in figure. The position of central maximum will,

A Young's double-slit experiment diagram where a thin glass slide is placed over the upper slit.

A.get shifted downwards B.get shifted upwards C.will remain the same D.data insufficient to conclude

Light transmitted by Nicol prism is,

A.partially polarised B.unpolarised C.plane polarised D.elliptically polarised

Q10

The transverse nature of light is shown in,

A.interference B.diffraction C.scattering D.polarisation

Q11

What is the shape of the wavefront produced by a point source located at a finite distance in a medium?

A.Plane wavefront B.Cylindrical wavefront C.Spherical wavefront D.Elliptical wavefront

Q12

According to Huygens' principle, every point on a wavefront acts as a source of what?

A.Primary waves B.Secondary wavelets C.Stationary waves D.Longitudinal waves

Q13

For two light sources to be considered coherent, which of the following conditions must be satisfied?

A.They must have the same intensity B.They must be produced by two different independent bulbs C.They must have a constant phase difference D.They must have different frequencies

Q14

If a Young's double-slit experiment is moved from air to a medium with a higher refractive index, what happens to the fringe width?

A.It increases B.It decreases C.It remains unchanged D.It becomes zero

Q15

In the context of light waves, a path difference of \(\delta\) is related to a phase difference \(\phi\) by which formula?

A.\(\phi = \frac{\lambda}{2\pi} \delta\) B.\(\phi = \frac{2\pi}{\lambda} \delta\) C.\(\phi = 2\pi \lambda \delta\) D.\(\phi = \frac{\pi}{\lambda} \delta\)

Q16

Why is the diffraction of light less commonly observed in everyday life compared to the diffraction of sound?

A.Light does not exhibit wave properties B.The speed of light is too high C.Light waves are longitudinal D.The wavelength of light is much smaller than common obstacles

Q17

Which type of diffraction involves a light source and a screen placed at an infinite distance from the diffracting obstacle?

A.Fresnel diffraction B.Fraunhofer diffraction C.Spherical diffraction D.Rayleigh diffraction

Q18

In a diffraction grating, what is the 'grating element' \(e\) defined as?

A.The width of a single slit B.The width of an opaque ruling C.The sum of the width of one slit and one ruling D.The total length of the grating

Q19

The phenomenon of polarization is unique to which type of waves?

A.Longitudinal waves only B.Transverse waves only C.Sound waves in air D.Mechanical waves only

Q20

Which property of certain crystals is used in a Nicol prism to produce plane polarized light?

A.Single refraction B.Total internal reflection of the O-ray C.Selective absorption D.Diffraction

Q21

In Brewster's Law, when light is incident at the polarizing angle \(i_p\), what is the relationship between the reflected and refracted rays?

A.They are parallel B.They are in opposite directions C.They are perpendicular to each other D.The refracted ray is totally reflected

Q22

For a healthy human eye, the distance of the 'near point' is approximately how many centimeters?

A.10 cm B.25 cm C.50 cm D.Infinity

Q23

What is the primary function of the eyepiece in a compound microscope?

A.To form a real, inverted image B.To act as a simple microscope to magnify the intermediate image C.To gather light from the object D.To reduce chromatic aberration

Q24

How can the resolving power of a microscope be increased?

A.By increasing the wavelength of light used B.By using light of a shorter wavelength C.By decreasing the numerical aperture D.By decreasing the refractive index of the medium

Q25

Which eye defect occurs when the eye cannot focus on both horizontal and vertical lines simultaneously?

A.Myopia B.Hypermetropia C.Presbyopia D.Astigmatism

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About this Wave Optics test

This free online practice test covers Wave Optics from the 12th Standard Physics (Samacheer Kalvi) syllabus. Choose the number of questions and an optional time limit, then answer and submit — everything is checked in your browser, with the correct answers and a worked explanation shown at the end. For the full solutions to every question in this set, see the solved MCQs page.

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