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Physics - Ray Optics

Practise 50 WBJEE previous year questions on Ray Optics, compiled from papers spanning 2009 to 2026. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty WBJEE tests.

Ray Optics has been asked in 18 of the 18 years of WBJEE papers analysed (2009–2026), with 50 questions in all. 32% of them were easy, 52% moderate and 16% tough. Most of its questions came from 2011, with 5 questions that year. In the last three years (2024–2026) it had 8 questions across 3 papers, about 2.7 per paper.

The chapter's 9 topics are not weighted equally: Lens Formula, Refraction of light from curved surface (16 questions, 32%), Refraction of light from plane surface (11 questions, 22%), and Mirror Formula, Reflection in Spherical Mirror (5 questions, 10%) have been asked the most. Lens Formula, Refraction of light from curved surface has also led over the last five years, with 4 questions. Lens Formula, Refraction of light from curved surface has produced the most tough questions (4).

  1. 1A person has a minimum distance of distinct vision of 50 cm. The power of lens required to read a book at a distance of 25 cm is2026Human eye
  2. 2A plano-convex lens fits exactly into a plano-concave lens. Their plane surfaces are parallel to each other. If lenses are made of different2026Lens Formula, Refraction of light from curved surface
  3. 3A ray of light travelling in air is incident on one face of a parallel glass slab of thickness a refractive index at an angle of incidence .2026Refraction of light from plane surface
  4. 4An electromagnetic wave, whose wave normal makes an angle of with the vertical, is travelling in air and strikes a horizontal liquid surface2026Refraction of light from plane surface
  5. 5Figure shows the graph of angle of deviation versus angle of incidence i for a light ray striking a prism. The prism angle is2025Prism and Dispersion of Light
  6. 6The convex lens and of equal focal length are placed at a distance apart. An object is placed at a distance in the left of as shown in figur2024Lens Formula, Refraction of light from curved surface
  7. 7If and represent, unit vectors along the incident ray, reflected ray and normal to the surface respectively, then2024Reflection of Light from Plane Mirror
  8. 8When a convex lens is placed above an empty tank, the image of a mark at the bottom of the tank, which is 45 cm from the lens is formed 36 c2024Lens Formula, Refraction of light from curved surface
  9. 9Three identical convex lenses each of focal length \(f\) are placed in a straight line separated by a distance \(f\) from each other. An obj2023Lens Formula, Refraction of light from curved surface
  10. 10A ray of monochromatic light is incident on the plane surface of separation between two media \(X\) and \(Y\) with angle of incidence 'i' in2023Refraction of light from plane surface
  11. 11The human eye has an approximate angular resolution of and typical photo printer prints a minimum of 300 dip (dots per inch, 1 inch ). At wh2022Human eye
  12. 12The cross-section of a reflecting surface is represented by the equation as shown in the figure. A ray travelling in the positive direction 2021Mirror Formula, Reflection in Spherical Mirror
  13. 13A spherical convex surface of power 5 dioptre separates object and image space of refractive indices and respectively. The radius of curvatu2021Lens Formula, Refraction of light from curved surface
  14. 14An object is placed in front of a convex mirror of focal length . A plane mirror is now placed facing the object in between the object and t2020Mirror Formula, Reflection in Spherical Mirror
  15. 15A thin convex lens is placed just above an empty vessel of depth . The image of a coin kept at the bottom of the vessel is thus formed above2020Refraction of light from plane surface
  16. 16A ray of light is reflected by a plane mirror. and be the unit vectors along the incident ray, reflected ray and the normal to the reflectin2019Reflection of Light from Plane Mirror
  17. 17A point object is placed on the axis of a thin convex lens of focal length at a distance of from the lens and its image is formed on the axi2019Lens Formula, Refraction of light from curved surface
  18. 18A point source is placed at coordinates (0,1) in -plane. A ray of light from the source is reflected on a plane mirror placed along the -axi2018Reflection of Light from Plane Mirror
  19. 19Two identical equiconvex lenses, each of focal length are placed side by side in contact with each other with a layer of water in between th2018Lens Formula, Refraction of light from curved surface
  20. 20There is a small air bubble at the centre of a solid glass sphere of radius and refractive index What will be the apparent distance of the b2018Lens Formula, Refraction of light from curved surface
  21. 21A ray of light is incident on a right angled isosceles prism parallel to its base as shown in the figure. Refractive index of the material o2018Critical angle and total internal reflection
  22. 22The ratio of the diameter of the sun to the distance between the earth and the sun is approximately The approximate diameter of the image of2017Mirror Formula, Reflection in Spherical Mirror
  23. 23A point object is held above a thin equiconvex lens at its focus. The focal length is and the lens rests on a horizontal thin plane mirror. 2017Combination of Lens and Mirrors
  24. 24A parallel beam of light is incident on a glass prism in the shape of a quarter cylinder of radius and refractive index placed on a horizont2017Critical angle and total internal reflection
  25. 25A ray of light strikes a glass plate at an angle of . If the reflected and refracted rays are perpendicular to each other, the refractive in2016Refraction of light from plane surface
  26. 26Light travels through a glass plate of thickness and having refractive index . If be the velocity of light in vacuum, time taken by the ligh2016Refraction of light from plane surface
  27. 27An object is located from the first of two thin converging lenses of focal lengths and respectively. The lenses are separated by . The final2015Combination of Lens and Mirrors
  28. 28A ray of light is incident at an angle on a glass slab of refractive index . The angla between reflected and refracted light is Then, the re2015Refraction of light from plane surface
  29. 29When light is refracted from a surface, which of its following physical parameters does not change?2015Refraction of light from plane surface
  30. 30A luminous object is separated from a screen by distance . A convex lens is placed between the object and the screen such that it forms a di2014Lens Formula, Refraction of light from curved surface
  31. 31The intermediate image formed by the objective of a compound microscope is2014Optical Instruments
  32. 32A glass slab consists of thin uniform layers of progressively decreasing refractive indices RI (see figure) such that the RI of any layer is2014Refraction of light from plane surface
  33. 33An object is placed away from a convex lens of focal length and a sharp image is formed on a screen. Now a concave lens is placed in contact2014Combination of Lens and Mirrors
  34. 34The least distance of vision of a long sighted person is . By using a spectacle lens, this distance is reduced to . The power of the lens is2013Human eye
  35. 35The glass prisms and are to be combined together to produce dispersion without deviation. The angles of the prisms and are selected as and r2013Prism and Dispersion of Light
  36. 36An object placed at a distance of from a magnification . If the object is moved towards the lens by , then again an image of magnification i2013Lens Formula, Refraction of light from curved surface
  37. 37A biconvex lens of focal length and radii of curvature of both the surfaces is made of a material of refractive index . This lens is placed 2013Lens Formula, Refraction of light from curved surface
  38. 38If the velocity of light in vacuum is , the time taken (in nanosecond) to travel through a glass plate of thickness and refractive index 1.52012Refraction of light from plane surface
  39. 39An object placed in front of a concave mirror at a distance of cm from the pole gives a 3 times magnified real image. If it is moved to a di2012Mirror Formula, Reflection in Spherical Mirror
  40. 40A diver at a depth of \(12 {~m}\) in water \( ( = {4}{3} )\) sees the sky in a cone of semivertical angle :2011Critical angle and total internal reflection
  41. 41Two thin lenses of focal lengths \(20 {~cm}\) and \(25 {~cm}\) are placed in cotact. The effective power of the combination is2011Lens Formula, Refraction of light from curved surface
  42. 42A convex lens of focal length \(30 {~cm}\) produces 5 times magnified real image of an object. What is the object distance ?2011Lens Formula, Refraction of light from curved surface
  43. 43If the focal length of the eye piece of a telescope is doubled, its magnifying power \(( {m})\) will be2011Optical Instruments
  44. 44A plano-concave lens is made of glass of refractive index 1.5 and the radius of curvature of its curved face is \(100 {~cm}\). What is the p2011Lens Formula, Refraction of light from curved surface
  45. 45Two mirrors at an angle produce 5 images of a point. The number of images produced when is decreased to is2010Reflection of Light from Plane Mirror
  46. 46The radius of the light circle observed by a fish at a depth of 12 meter is (refractive index of water )2010Critical angle and total internal reflection
  47. 47A plano-convex lens is silvered at plane surface. Now focal length will be :2010Lens Formula, Refraction of light from curved surface
  48. 48The distance between an object and a divergent lens is times the focal length of the lens. The linear magnification produced by the lens is2009Lens Formula, Refraction of light from curved surface
  49. 49A object is placed in front of a concave mirror of focal length . What is the size and nature of the image?2009Mirror Formula, Reflection in Spherical Mirror
  50. 50A beam of monochromatic blue light of wavelength in air travels in water of refractive index . Its wavelength in water will be:2009Refraction of light from plane surface

Frequently Asked Questions

1.How many questions are available for Ray Optics?

This chapter includes 50 questions compiled from WBJEE papers spanning 2009 to 2026.

2.Are these questions only from WBJEE, or from other exams too?

These are WBJEE questions specifically for the Ray Optics chapter. Questions from other exams like JEE Main or NTA Abhyas (JEE Main) are organised separately under their respective exam sections.

3.Is Ray Optics an important chapter for WBJEE Physics?

Ray Optics has appeared in 18 of the 18 years of WBJEE papers covered here, with 50 questions across 18 papers - about 3 per paper it appears in.

4.What is the difficulty level of Ray Optics questions in WBJEE?

Of the 50 questions analysed for this chapter, 32% are easy, 52% moderate and 16% tough. 2011 had the most, with 5 questions.

5.Which topics in Ray Optics should I focus on?

These topics have carried the most weightage in Ray Optics:

  • Lens Formula, Refraction of light from curved surface - 16 questions (32%)
  • Refraction of light from plane surface - 11 questions (22%)
  • Mirror Formula, Reflection in Spherical Mirror - 5 questions (10%)
  • Lens Formula, Refraction of light from curved surface has produced the most tough questions (4).
6.Is Ray Optics's weightage in WBJEE going up or down?

Across all 18 papers analysed, Ray Optics has averaged about 2.8 questions per paper. In the last three years (2024–2026), that average has stayed about the same, at about 2.7 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.