JEE Physics - MCQ Practice Questions

In Young's double slit experiment, if one slit is covered with a transparent film of thickness t and refractive index μ, the path difference changes by:

A lens combination consists of a convex lens (f=15 cm) and concave lens (f=-10 cm) in contact. Find the power of combination.

When a convex lens is immersed in water (n=$\frac{4}{3}$), its focal length compared to air is:

The minimum deviation through a prism occurs when:

The Brewster angle for glass-air interface (n_glass = 1.5) is approximately:

In Fraunhofer diffraction by a single slit, if the slit width is doubled, how does the angular width of the central maximum change?

Two slits of widths w₁ and w₂ produce a diffraction pattern with intensity ratio I₁:I₂ = 4:1. What is the ratio of their widths?

A biconvex lens (n = 1.5) has both radii of curvature equal to 20 cm. What is its focal length?

In a double-slit experiment, if one slit is covered with a transparent film of thickness t and refractive index n, the central bright fringe shifts. What is the path difference introduced?

A monochromatic light source of wavelength λ is incident on a diffraction grating with 500 lines/mm. The second-order maximum is at 30°. What is the wavelength?

A parallel beam of light undergoes diffraction through a circular aperture of diameter D. The radius of the first dark ring in Fraunhofer diffraction is proportional to:

A thin lens of refractive index 1.5 is placed in a medium of refractive index 1.33. If its focal length in air is 20 cm, what is its focal length in the medium?

In Fraunhofer diffraction through a circular aperture, the angular radius of the first dark ring (Airy disk) is θ = 1.22λ/D. For D = 1 mm and λ = 500 nm, what is this angle in radians?

In a compound microscope, the objective has focal length 0.5 cm and eyepiece has focal length 5 cm. If the least distance of distinct vision is 25 cm, the magnifying power is:

In a fiber optics cable, light undergoes total internal reflection. The minimum refractive index of the core material needed to guide light from air is:

When light passes through a glass slab of thickness t and refractive index n, the lateral displacement is maximum when the angle of incidence is:

In Brewster's angle incidence, the reflected and refracted rays are:

A thin air gap of thickness d is created between two glass plates. For constructive interference in reflected light with wavelength λ, the condition is:

In a diffraction grating with 5000 lines/cm, the second order spectrum is observed at angle 30°. The wavelength of light is:

In a compound microscope, the objective has focal length 0.5 cm and eyepiece has focal length 5 cm. The distance between them is 20 cm. The magnifying power is approximately: