JEE Main Physics — Optics previous year questions with solutions.
Two coherent light sources having intensity in the ratio $2x$ produce an interference pattern. The ratio $\frac{{I}_{\mathrm{max}}-{I}_{\mathrm{min}}}{{I}_{\mathrm{max}}+{I}_{\mathrm{min}}}$ will be
Three rays of light, namely red $(R)$, green $(G)$ and blue $(B)$ are incident on the face $PQ$ of a right angled prism $PQR$ as shown in figure.  The refractive indices of the material of the prism for red, green and blue wavelength are $1.27,1.42$ and $1.49$ respectively. The colour of the ray(s) emerging out of the face $PR$ is :
The thickness at the centre of a plano convex lens is $3\mathrm{mm}$ and the diameter is $6\mathrm{cm}.$ If the speed of light in the material of the lens is $2\times {10}^{8}{ms}^{-1}.$ The focal length of the lens is ___________.
The same size images are formed by a convex lens when the object is placed at $20\mathrm{cm}$ or at $10\mathrm{cm}$ from the lens. The focal length of convex lens is
The refractive index of a converging lens is $1.4$. What will be the focal length of this lens if it is placed in a medium of same refractive index ? (Assume the radii of curvature of the faces of lens are ${R}_{1}$ and ${R}_{2}$ respectively)
The light waves from two coherent sources have same intensity ${I}_{1}={I}_{2}={I}_{0}.$ In interference pattern the intensity of light at minima is zero. What will be the intensity of light at maxima?
The incident ray, reflected ray and the outward drawn normal are denoted by the unitvectors $\vec{a},\vec{b}$and $\vec{c}$ respectively. Then choose the correct relation for these vectors.
The image of an object placed in air formed by a convex refracting surface is at a distance of $10m$ behind the surface. The image is real and is at $\frac{{2}^{rd}}{3}$ of the distance of the object from the surface. The wavelength of light inside the surface is $\frac{2}{3}$ times the wavelength in air. The radius of the curved surface is $\frac{x}{13}m$, the value of $x$ is ______ .
The focal length $f$ is related to the radius of curvature $r$ of the spherical convex mirror by:
The expected graphical representation of the variation of angle of deviation ' $\delta$ ' with angle of incidence 'i' in a prism is :
The difference in the number of waves when yellow light propagates through air and vacuum columns of the same thickness is one. The thickness of the air column is _____ $\mathrm{mm}$. [Refractive index of air $=1.0003$, the wavelength of yellow light in vacuum $=6000\overset{\circ }{A}]$
The angle of deviation through a prism is minimum when  (A) Incident ray and emergent ray are symmetric to the prism (B) The refracted ray inside the prism becomes parallel to its base (C) Angle of incidence is equal to that of the angle of emergence (D) When angle of emergence is double the angle of incidence Choose the correct answer from the options given below :
Region $I$ and $\mathrm{II}$ are separated by a spherical surface of radius $25\mathrm{cm}$. An object is kept in region $I$ at a distance of $40\mathrm{cm}$ from the surface. The distance of the image from the surface is: 
A convex lens of focal length 20 cm forms an image...
In Young's double slit experiment, if the source of light changes from orange to blue then:
In Young's double slit arrangement, slits are separated by a gap of $0.5\mathrm{mm}$, and the screen is placed at a distance of $0.5m$ from them. The distance between the first and the third bright fringe formed when the slits are illuminated by a monochromatic light of $5890\overset{o}{A}$ is :-
In the Young's double slit experiment, the distance between the slits varies in time as $d(t)={d}_{0}+{a}_{0}\mathrm{sin}\omega t$; where ${d}_{0},\omega$ and ${a}_{0}$ are constants. The difference between the largest fringe width and the smallest fringe width obtained over time is given as:
In a Young's double slit experiment two slits are separated by $2\mathrm{mm}$ and the screen is placed one meter away. When a light of wavelength $500\mathrm{nm}$ is used, the fringe separation will be :
In a Young's double slit experiment, the width of the one of the slit is three times the other slit. The amplitude of the light coming from a slit is proportional to the slit-width. Find the ratio of the maximum to the minimum intensity in the interference pattern.
In a Young's double slit experiment, the slits are separated by $0.3\mathrm{mm}$ and the screen is $1.5m$ away from the plane of slits. Distance between fourth bright fringes on both sides of central bright fringe is $2.4\mathrm{cm}.$ The frequency of light used is $x\times {10}^{14}\mathrm{Hz}.$
If the source of light used in a Young's double slit experiment is changed from red to violet:
Given below are two statements : one is labeled as Assertion $A$ and the other is labeled as Reason $R$. Assertion $A$: For a simple microscope, the angular size of the object equals the angular size of the image. Reason $R$: Magnification is achieved as the small object can be kept much closer to the eye than $25\mathrm{cm}$ and hence it subtends a large angle. In the light of the above statements, choose the most appropriate answer from the options given below:
Find the distance of the image from object $O,$ formed by the combination of lenses in the figure: 
Curved surfaces of a plano-convex lens of refractive index ${\mu }_{1}$ and a plano-concave lens of refractive index ${\mu }_{2}$ have equal radius of curvature as shown in figure. Find the ratio of radius of curvature to the focal length of the combined lenses 