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Optics Questions

Practice 50 Optics questions with detailed answers and explanations. Free MCQs, PYQs, and mock test questions for NEET, JEE, GATE, SSC and more.

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50
Total Questions
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13
Easy
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29
Medium
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8
Hard
Practice by Exam:Physics(49)General Awareness(1)

About optics — practice questions, PYQs & concepts

optics is a frequently-tested topic on Physics, General Awareness. ExamTest.live currently lists 50 optics questions spanning previous-year papers from 2026 to 2026, each with worked solutions and a step-by-step explanation. Use the filters on this page to focus on a specific exam, difficulty level or year — every answer key is free, no sign-up required.

optics weight in competitive exams

Across our optics question bank, the largest sources are Physics (49) and General Awareness (1). Click any exam chip above to drill down to that exam-specific question set.

How to use this page

  • Start easy: 13 easy optics questions are available — build fluency before moving up.
  • Target weak years: Use the year filter to focus on the most recent 2026 paper or older PYQs you have not attempted.
  • Time yourself: Every question shows the average solve time so you can benchmark your speed against other students.
  • Read every explanation: Even on questions you got right — the explanation often surfaces a faster approach you can reuse.

All Optics Questions(1–50 of 50)

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Q1mediummcqPhysicsSSC CGL2026
0% accuracy
Who is credited with inventing the reflecting telescope?
Q2easymcqPhysicsCompetitive Exam Practice Paper2026
0% accuracy
The main reason for the blueness of the sky is :
Q3mediummcqPhysicsAIEEE 20042026
50% accuracy
A light ray is incident perpendicular to one face of a prism and is totally internally reflected at the glass-air interface. If the angle of reflection is , we conclude that the refractive index is:
image
Q4hardmcqPhysicsAIEEE 20042026
0% accuracy
A plano-convex lens of refractive index and radius of curvature is silvered at the curved surface. At what distance from this lens should an object be placed in order to have a real image of the same size as the object?
Q5easymcqPhysicsAIEEE 20042026
50% accuracy
The angle of incidence at which reflected light is totally polarized for reflection from air to glass (refractive index ), is:
Q6mediummcqPhysicsAIEEE 20042026
0% accuracy
The maximum number of possible interference maxima for slit-separation equal to twice the wavelength in Young’s double-slit experiment is:
Q7mediummcqPhysicsAIEEE 20042026
50% accuracy
An electromagnetic wave of frequency passes from vacuum into a dielectric medium with permittivity . Then:
Q8easymcqPhysicsAIEEE2026
An initially parallel cylindrical beam travels in a medium of refractive index . The initial shape of the wave front of the beam is:
Q9easymcqPhysicsAIEEE2026
When an unpolarized light of intensity is incident on a polarizing sheet, the intensity of the light which does not get transmitted is:
Q10mediummcqPhysicsAIEEE2026
If is the intensity of the principal maximum in the single slit diffraction pattern, then what will be its intensity when the slit width is doubled?
Q11easymcqPhysicsAIEEE 20032026
To demonstrate the phenomenon of interference we require two sources which emit radiation of:
Q12easymcqPhysicsAIEEE 20032026
The image formed by an objective of a compound microscope is:
Q13easymcqPhysicsAIEEE 20032026
To get three images of a single object, one should have two plane mirrors at an angle of:
Q14mediummcqPhysicsAIEEE2026
An experiment is performed to find the refractive index of glass using a travelling microscope. In this experiment, distances are measured by:
Q15hardmcqPhysicsAIEEE2026
An initially parallel cylindrical beam travels in a medium of refractive index , where and are positive constants and is the intensity of the light beam. The intensity of the beam is decreasing with increasing radius. As the beam enters the medium, it will:
Q16mediummcqPhysicsAIEEE2026
A thin glass (refractive index ) lens has optical power of in air. Its optical power in a liquid medium with refractive index will be:
Q17easymcqPhysicsAIEEE2026
An initially parallel cylindrical beam travels in a medium of refractive index . The speed of light in the medium is:
Q18mediummcqPhysicsFIITJEE AIEEE 2011 (Set Q)2026
Let the plane be the boundary between two transparent media. Medium 1 in has a refractive index of and medium 2 with has a refractive index of . A ray of light in medium 1 given by the vector is incident on the plane of separation. The angle of refraction in medium 2 is:
Q19hardmcqPhysicsAIEEE 20122026
An object in front of a lens forms a sharp image on a film behind the lens. A glass plate thick, of refractive index is interposed between lens and film with its plane faces parallel to film. At what distance (from lens) should object be shifted to be in sharp focus on film?
Q20mediummcqPhysicsJEE Main2026
A beam of unpolarised light of intensity is passed through a polaroid and then through another polaroid which is oriented so that its principal plane makes an angle of relative to that of . The intensity of the emergent light is:
Q21mediummcqPhysicsJEE Main2026
Two coherent point sources and are separated by a small distance as shown. The fringes obtained on the screen will be:
image
Q22mediummcqPhysicsJEE Main2026
The graph between angle of deviation () and angle of incidence () for a triangular prism is represented by:
image
Q23mediummcqPhysicsJEE Main2026
Diameter of plano-convex lens is and thickness at the centre is . If speed of light in material of lens is , the focal length of the lens is:
Q24mediummcqGeneral AwarenessStaff Selection Commission2026
Identify the option that arranges the speed of light in descending order in different mediums.
Q25mediummcqPhysicsIndian Competitive Exams2026
Who was the first one to use a glass prism to obtain the spectrum of sunlight?
Q26mediummcqPhysicsAIEEE2026
Two point white dots are apart on a black paper. They are viewed by eye of pupil diameter . Approximately, what is the maximum distance at which these dots can be resolved by the eye? [Take wavelength of light ]
Q27mediummcqPhysicsAIEEE2026
A fish looking up through the water sees the outside world contained in a circular horizon. If the refractive index of water is and the fish is below the surface, the radius of this circle in cm is:
Q28mediummcqPhysicsAIEEE2026
A Young’s double slit experiment uses a monochromatic source. The shape of the interference fringes formed on a screen is:
Q29easymcqPhysicsNEET (UG) 20242026
A small telescope has an objective of focal length and an eye piece of focal length . The magnifying power of telescope for viewing a distant object is:
Q30easymcqPhysicsNEET (UG) 20242026
An unpolarised light beam strikes a glass surface at Brewster's angle. Then:
Q31hardmcqPhysicsNEET (UG) 20242026
A light ray enters through a right angled prism at point P with the angle of incidence as shown in figure. It travels through the prism parallel to its base and emerges along the face . The refractive index of the prism is:
image
Q32easymcqPhysicsNEET (UG) 20242026
If the monochromatic source in Young's double slit experiment is replaced by white light, then:
Q33mediummcqPhysicsNEET 20232026
For Young's double slit experiment, two statements are given below:Statement I: If the screen is moved away from the plane of slits, the angular separation of the fringes remains constant.Statement II: If the monochromatic source is replaced by another monochromatic source of larger wavelength, the angular separation of fringes decreases.In the light of the above statements, choose the correct answer:
Q34mediummcqPhysicsNEET 20222026
In a Young's double slit experiment, a student observes fringes in a certain segment of screen when a monochromatic light of wavelength is used. If the wavelength of light is changed to , then the number of fringes he would observe in the same region of the screen is:
Q35mediummcqPhysicsPhysics
0% accuracy
The angular resolution of a 10 cm diameter telescope at a wavelength of 5000 Å is of the order of :
Q36hardmcqPhysicsPhysics
A beam of light consisting of red, green and blue colours is incident on a right angled prism. The refractive index of the material of the prism for the above red, green and blue wavelengths are and respectively. The prism will:
image
Q37hardmcqPhysicsPhysics
In an astronomical telescope in normal adjustment, a straight black line of the length is drawn on the objective lens. The eye-piece forms a real image of this line. The length of this image is . The magnification of the telescope is:
Q38mediummcqPhysicsPhysics
Two slits in Young’s experiment have widths in the ratio . The ratio of intensity at the maxima and minima in the interference pattern, is:
Q39mediummcqPhysicsPhysics
At the first minimum adjacent to the central maximum of a single-slit diffraction pattern, the phase difference between the Huygen's wavelet from the edge of the slit and the wavelet from the midpoint of the slit is:
Q40mediummcqPhysicsPhysics
A parallel beam of fast moving electrons is incident normally on a narrow slit. If the speed of electrons is increased:
Q41hardmcqPhysicsPhysics
In YDSE, slits are apart and . Two wavelengths and are used. At what minimum distance from the central fringe will their bright fringes coincide?
Q42hardmcqPhysicsPhysics
For a normal eye, the cornea provides power of and the eye lens provides . The estimated distance between the retina and the lens is:
Q43mediummcqPhysicsPhysics
A plano-convex lens () fits exactly into a plano-concave lens (). Their plane surfaces are parallel. Focal length of the combination is:
Q44mediummcqPhysicsPhysics
A prism () is combined with another () to produce dispersion without deviation. The angle of the second prism is:
Q45mediummcqPhysicsPhysics
A converging beam of rays incident on a diverging lens intersects at on the opposite side. If the lens is removed, they meet closer. The focal length is:
Q46easymcqPhysicsPhysics
A ray of light travelling in a transparent medium of refractive index , falls on a surface separating the medium from air at an angle of incidence of . For which of the following values of the ray can undergo total internal reflection?
Q47mediummcqPhysicsPhysics
A lens having focal length and aperture of diameter forms an image of intensity . Aperture of diameter in central region of lens is covered by a black paper. Focal length of lens and intensity of image now will be respectively:
Q48easymcqPhysicsPhysics
The frequency of a light wave in a material is and wavelength is . The refractive index of material will be:
Q49mediummcqPhysicsPhysics
A small coin is resting on the bottom of a beaker filled with a liquid. A ray of light from the coin travels up to the surface of the liquid and moves along its surface. How fast is the light traveling in the liquid?
Q50mediummcqPhysicsPhysics
The angular resolution of a 10 cm diameter telescope at a wavelength of 5000 Å is of the order of :

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How many Optics questions are on ExamTest.live?▼
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Which exams include Optics questions?▼
Optics questions are commonly asked in Physics, General Awareness. You can filter by exam using the links above.
How do I practice Optics questions effectively?▼
Start with easy questions to build confidence, then tackle medium and hard ones. Use the filter buttons to sort by difficulty. Reveal the answer only after attempting each question, and read the explanation thoroughly.