NEET UG · Physics

Ray and Wave Optics

17 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 17 questions

  1. An object is placed at a distance of 30 cm in front of a concave mirror of focal length 15 cm. What are the position, nature, and magnification of the image formed?
  2. A transparent glass slab of thickness t = 6 cm and refractive index μ = 1.5 is placed over a printed letter on a table. By what distance does the letter appear to be raised when viewed normally from a…
  3. Under what conditions does Total Internal Reflection (TIR) occur at the boundary between two optical media?
  4. A biconvex glass lens of refractive index μ_g = 1.5 has a focal length f_a = 20 cm in air. What will be its focal length f_w when completely immersed in water of refractive index μ_w = 4/3?
  5. Two thin lenses of optical powers +5.0 D and -3.0 D are placed in coaxial contact with each other. What is the focal length of the resulting combination?
  6. For an equilateral triangular glass prism (A = 60°), the angle of minimum deviation is measured to be Dm = 30°. What is the refractive index μ of the prism material?
  7. An astronomical telescope has an objective lens of focal length fo = 100 cm and an eyepiece of focal length fe = 5 cm. What are the magnifying power m and the separation L between the lenses when adju…
  8. According to Huygens' principle, what is the geometric shape of the wavefront originating from a point source located at a finite distance in an isotropic medium, and what shape does it take at an ext…
  9. In Young's Double Slit Experiment, monochromatic light of wavelength λ produces interference fringes of width β on a screen placed at distance D from slits separated by d. If the entire experimental a…
  10. In Young's double slit experiment, the path difference between two interfering light waves at a point on the screen is Δx = 3.5 λ (where λ is the wavelength). What type of interference occurs at this…
  11. Two coherent monochromatic sources of intensities I₁ = I₀ and I₂ = 4I₀ interfere on a screen. What are the maximum intensity (I_max) and minimum intensity (I_min) observed in the interference pattern?
  12. In a single slit diffraction experiment, light of wavelength λ = 600 nm passes through a slit of width a = 0.2 mm. What is the total angular width (in radians) of the central diffraction maximum on a…
  13. How does the resolving power of an astronomical telescope depend on the wavelength λ of light and the diameter D of its objective lens aperture?
  14. A beam of unpolarized light in air strikes the surface of a flat transparent dielectric slab of refractive index μ = √3 at Brewster's angle (polarizing angle ip). What are the angle of incidence ip an…
  15. Unpolarized light of intensity I₀ passes through a polarizing filter P1. The transmitted light then passes through a second filter P2 whose transmission axis is oriented at 60° relative to P1. What is…
  16. What is the primary optical difference between interference and diffraction of light?
  17. A compound microscope has an objective lens of focal length fo = 1.0 cm and an eyepiece of focal length fe = 2.5 cm. If an object is placed at a distance uo = 1.1 cm from the objective lens, what is t…

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