This page covers NDA Wave Optics with complete concept notes, 18 graded practice MCQs, key points and exam-specific tips. Free to study.
18graded MCQs · easy to hard · full solution & trap analysis
Two coherent light sources of wavelength 500 nm produce an interference pattern. If the path difference at a point is 1500 nm, how many wavelengths does this path difference represent?
A monochromatic light of wavelength 600 nm passes through a single slit of width 0.3 mm. What is the order of the first dark fringe in single slit diffraction?
In a diffraction grating experiment, light of wavelength 550 nm is incident normally. The second order maximum occurs at an angle of 30°. What is the grating spacing (distance between adjacent slits)?
Light of frequency 6 × 10¹⁴ Hz passes through a medium of refractive index 1.5. What is the wavelength of light in the medium? (Speed of light = 3 × 10⁸ m/s)
In Young's double slit experiment, the distance between two slits is 1 mm, and they are illuminated with light of wavelength 650 nm. The distance to the screen is 1 m. What is the fringe width?
In Young's double slit setup, if the slit separation is halved while keeping wavelength and screen distance constant, the fringe width becomes:
A diffraction grating has 2000 lines per cm. What is the grating spacing (d)?
In a diffraction grating experiment, light of wavelength 480 nm produces a second-order maximum at angle 60°. What is the grating spacing?
Two incoherent light sources of equal intensity I₀ are superposed. What is the resultant intensity?
A diffraction pattern from a single slit shows the central maximum width of 4 mm on a screen 1.5 m away. If the wavelength is 600 nm, what is the slit width?
Two coherent light sources of wavelength 600 nm are separated by a distance of 3 mm. They are placed in front of a screen at a distance of 2 m. What is the fringe width in the interference pattern?
In Young's double slit experiment, the distance between the first minima and the central maxima is 2 mm. If the wavelength is 500 nm and the distance to screen is 1 m, what is the slit separation?
A single slit of width 0.1 mm produces a diffraction pattern with the first minima at 30°. What is the wavelength of light used?
Two light waves of amplitudes A₁ = 4 units and A₂ = 3 units interfere constructively. What is the resultant amplitude?
In a diffraction grating experiment, light of wavelength 400 nm is incident normally. If the grating has 5000 lines per cm, what is the grating spacing?
When monochromatic light of wavelength 550 nm passes through a single slit of width 0.11 mm, the first minimum occurs at an angle of 30°. Which statement is correct according to single slit diffraction?
In Young's double slit experiment, the distance between two slits is 0.5 mm, the distance to the screen is 1 m, and the wavelength of light is 500 nm. Calculate the fringe width.
Two coherent light sources of wavelength 600 nm produce an interference pattern. If the path difference between two points on the screen is 1800 nm, how many wavelengths of path difference exist?