List of top Physics Questions on Ray optics and optical instruments asked in JEE Main

An effective power of a combination of 5 identical convex lenses which are kept in contact along the principal axis is 25 D. Focal length of each of the convex lens is :

The position of the image formed by the combination of lenses is :

Given below are two statements:
Statement (I): When an object is placed at the centre of curvature of a concave lens, image is formed at the centre of curvature of the lens on the other side.
Statement (II): Concave lens always forms a virtual and erect image.
In the light of the above statements, choose the correct answer from the options given below:

If the distance between object and its two times magnified virtual image produced by a curved mirror is 15 cm, the focal length of the mirror must be :

The distance between object and its 3 times magnified virtual image as produced by a convex lens is 20 cm. The focal length of the lens used is __________ cm.

The distance between object and its two times magnified real image as produced by a convex lens is 45 cm. The focal length of the lens used is ______ cm.

A convex mirror of radius of curvature 30 cm forms an image that is half the size of the object. The object distance is:

An object is placed Infront of a plane mirror 12 cm away from it. The object is kept fixed while the plane mirror is shifted towards the object by a distance of 4 cm. The length of shift in the position of image is equal to ___________ cm.

A pole is vertically submerged in swimming pool, such that it gives a length of shadow 2.15 m within water when sunlight is incident at an angle of 30o with the surface of water. If swimming pool is filled to a height of 1.5 m, then the height of the pole above the water surface in centimeters is (n-w = 4/3) ____________

When one light ray is reflected from a plane mirror with 30° angle of reflection, the angle of deviation of the ray after reflection is :

A monochromatic light wave with wavelength \(λ_1\) and frequency \(v_1\) in air enters another medium. If the angle of incidence and angle of refraction at the interface are 45° and 30° respectively, then the wavelength \(λ_2\) and frequency \(v_2\) of the refracted wave are : 

A ray of light is incident from air on a glass plate having thickness $\sqrt{3} cm$ and refractive index $\sqrt{2}$ The angle of incidence of a ray is equal to the critical angle for glass-air interface The lateral displacement of the ray when it passes through the plate is ___$\times 10^{-2} cm$ (given $\sin 15^{\circ}=026$ )

Unpolarised light is incident on the boundary between two dielectric media, whose dielectric constants are 2.8 (medium −1 ) and 6.8 (medium −2 ), respectively. To satisfy the condition, so that the reflected and refracted rays are perpendicular to each other, the angle of incidence should be $ tan^{−1}(1+\frac{10}\theta )^{\frac{1} 2}$, then the value of 𝜃 is _______.
(Given for dielectric media, $ \mu_r=1$ )

A thin cylindrical rod of length $10\, cm$ is placed horizontally on the principle axis of a concave mirror of focal length $20 \,cm$ The rod is placed in a such a way that mid point of the rod is at $40 \,cm$ from the pole of mirror The length of the image formed by the mirror will be $\frac{x}{3} cm$ The value of $x$ is ______

A thin prism $P_1$ with an angle $6^{\circ}$ and made of glass of refractive index $154$ is combined with another prism $P_2$ made from glass of refractive index $172$ to produce dispersion without average deviation The angle of prism $P_2$ is

When a beam of white light is allowed to pass through convex lens parallel to principal axis, the different colours of light converge at different point on the principle axis after refraction This is called :

A microscope is focused on an object at the bottom of a bucket If liquid with refractive index $\frac{5}{3}$ is poured inside the bucket, then microscope have to be raised by $30\, cm$ to focus the object again The height of the liquid in the bucket is :

As shown in the figure, a combination of a thin plano concave lens and a thin plano convex lens is used to image an object placed at infinity The radius of curvature of both the lenses is $30 \,cm$ and refraction index of the material for both the lenses is $175$ Both the lenses are placed at distance of $40 \,cm$ from each other Due to the combination, the image of the object is formed at distance $x=$__ $cm$, from concave lens.

A convex lens of refractive index $15$ and focal length $18 \,cm$ in air is immersed in water. The change in focal length of the lens will be_______ cm (Given refractive index of water =\(\frac{4}{3}\))

A person has been using spectacles of power $-1.0$ dioptre for distant vision and a separate reading glass of power $2.0$ dioptres What is the least distance of distinct vision for this person :

In an experiment for estimating the value of focal length of converging mirror, image of an object placed at $40\, cm$ from the pole of the mirror is formed at distance $120 \,cm$ from the pole of the mirror These distances are measured with a modified scale in which there are $20$ small divisions in $1 \,cm$ The value of error in measurement of focal length of the mirror is $\frac{1}{ K } cm$ The value of $K$ is ______

In an experiment for estimating the value of focal length of converging mirror, image of an object placed at $40\, cm$ from the pole of the mirror is formed at distance $120 \,cm$ from the pole of the mirror These distances are measured with a modified scale in which there are $20$ small divisions in $1 \,cm$ The value of error in measurement of focal length of the mirror is $\frac{1}{ K } cm$ The value of $K$ is ______

If light is passing through a medium of critical angle 45°, then the wave speed will be