JEE Main Physics — Optics previous year questions with solutions.
A point source of light $S$, placed at a distance $60\mathrm{cm}$ infront of the centre of a plane mirror of width $50\mathrm{cm}$, hangs vertically on a wall. A man walks infront of the mirror along a line parallel to the mirror at a distance $1.2m$ from it (see in the figure). The distance between the extreme points where he can see the image of the light source in the mirror is__$\mathrm{cm}$ 
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?
A prism of refractive index ${n}_{1}$ and another prism of refractive index ${n}_{2}$ are stuck together (as shown in the figure). ${n}_{1}$ and ${n}_{2}$ depend on $\lambda ,$ the wavelength of light, according to the relation ${n}_{1}=1.2+\frac{10.8\times {10}^{-14}}{{\lambda }^{2}}$ and ${n}_{2}=1.45+\frac{1.8\times {10}^{-14}}{{\lambda }^{2}}$ The wavelength for which rays incident at any angle on the interface $BC$ pass through without bending at that interface will be ____ $\mathrm{nm}.$ 
Cross-section view of a prism is the equilateral triangle $ABC$ shown in the figure. The minimum deviation is observed using this prism when the angle of incidence is equal to the prism angle. The time taken by light to travel from $P$ (midpoint of $BC$) to $A$ is ___________ $\times {10}^{-10}s.$ (Given, speed of light in vacuum $=3\times {10}^{8}m{s}^{-1}$ and $\mathrm{cos}30^{\circ}=\frac{\sqrt{3}}{2}$) 
Consider the diffraction pattern obtained from the sunlight incident on a pinhole of diameter $0.1\mu m.$ If the diameter of the pinhole is slightly increased, it will affect the diffraction pattern such that
An unpolarized light beam is incident on the polarizer of a polarization experiment and the intensity of light beam emerging from the analyzer is measured as $100$ Lumens. Now, if the analyzer is rotated around the horizontal axis (direction of light) by $30^{\circ}$ in clockwise direction, the intensity of emerging light will be _______Lumens.
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 $x\times {10}^{14}\mathrm{Hz}.$
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: 
An object is placed at the focus of concave lens having focal length $f.$ What is the magnification and distance of the image from the optical centre of the lens?
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.
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 $=6000\overset{\circ }{A}]$
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
If the source of light used in a Young's double slit experiment is changed from red to violet:
An object is placed beyond the centre of curvature $C$ of the given concave mirror. If the distance of the object is ${d}_{1}$ from $C$ and the distance of the image formed is ${d}_{2}$ from $C,$ the radius of curvature of this mirror is:
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 :
The focal length $f$ is related to the radius of curvature $r$ of the spherical convex mirror by:
Your friend is having eye sight problem. She is not able to see clearly a distant uniform window mesh and it appears to her as nonuniform and distorted. The doctor diagnosed the problem as :
The expected graphical representation of the variation of angle of deviation ' $\delta$ ' with angle of incidence 'i' in a prism is :
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 
A ray of light entering from air into a denser medium of refractive index $\frac{4}{3}$, as shown in figure. The light ray suffers total internal reflection at the adjacent surface as shown. The maximum value of angle $\theta$ should be equal to: 
The refractive index of a medium where speed of light is 2 × 10⁸ m/s is:
A double convex lens has power $P$ and same radii of curvature $r$ of both the surfaces. The radius of curvature of a surface of a plano-convex lens made of the same material with power $1.5P$ is :
Two light waves having the same wavelength $\lambda$ in vacuum are in phase initially. Then the first wave travels a path ${L}_{1}$ through a medium of refractive index ${n}_{1}$while the second wave travels a path of length ${L}_{2}$ through a medium of refractive index ${n}_{2}$. After this the phase difference between the two waves is:
A point object in air is in front of the curved surface of a plano-convex lens. The radius of curvature of the curved surface is $30cm$ and the refractive index of the lens material is $1.5,$ then the focal length of the lens (in cm) is ___________.