List of top Physics Questions on Wave optics

The distance for which ray optics becomes a good approximation for an aperture of 0.3 cm and a light of wavelength 6000 $\text{\AA}$ is

When two light waves of equal intensity superimpose, the maximum intensity obtained is I. If the intensity of one of the waves is quadrupled, then the maximum intensity obtained is

If the angle of minimum deviation produced by an equilateral prism is equal to the angle of the prism, then the refractive index of the material of the prism is nearly

If the distances of the object and its real image from the principal focus of a concave mirror are 16 cm and 9 cm respectively, then the focal length of the mirror is

A meteor of mass 'm' having a speed 'v' at infinity reaches the surface of the earth with a speed of (\(v_e\) is escape speed from the earth's surface)

If the amplitudes of a damped harmonic oscillator at times t=0, \(t_1\) and \(t_2\) are \(A_0\), \(A_1\) and \(A_2\) respectively, then the amplitude of the oscillator at a time of \((t_1+t_2)\) is

When unpolarised light from air incidents on the surface of a medium of refractive index $\sqrt{3}$, then the reflected light is totally polarised. The angle of refraction is

The angle between the axes of the polarizer and the analyzer is $60^{\circ}$. The ratio of the intensity of unpolarized light incident on the polarizer and the intensity of the polarized light emerging from the analyzer is

The wavelength of the monochromatic light used in Young's double slit experiment is 550 nm and the screen is placed at a distance of 120 cm from the plane of the slits. If third dark fringe is formed on the screen at a distance of 1.5 mm from the central bright fringe, then the distance of separation between the two slits is

In an experiment, the angular width of interference fringes for a light of wavelength 5896 Å is found to be $3.5\times10^{-3}$ radian. The wavelength of light for which the angular width of the fringes becomes 10% greater is:

A radioactive element $^{242}_{92}X$ emits two $\alpha$ particles, one electron and two positrons. The product nucleus is represented by $^{234}_P Y$. The value of P is

The fundamental frequency of sonometer wire is 'n'. If the tension and length are increased 3 times and diameter is increased twice, the new frequency will be

A body when projected at an angle \( \theta \) with the horizontal reaches a maximum height \( H \). The time of flight of the body will be ( \( g \) = acceleration due to gravity)

The fundamental frequency of a closed pipe of length \(L\) is equal to the second overtone of a pipe open at both the ends of length (XL). The value of X is (Neglect end correction)

The instantaneous value of current in an a.c. circuit is \(I = 3 \sin (50\pi t + \frac{\pi}{4})\text{A}\). The current will be maximum for the first time at

When source of sound moves towards a stationary observer, the apparent frequency heard by him

Two polaroids are placed in the path of unpolarised beam of intensity ' $\text{I}_0$ ' such that no light is emitted from the second polaroid. If a third polaroid whose polarisation axis makes an angle ' $\theta$ ' with the polarisation axis of first polaroid is placed between these polaroids then the intensity of light emerging from the last polaroid will be}

Two bodies A and B at temperatures ' $\text{T}_1$ ' $\text{K}$ and ' $\text{T}_2$ ' $\text{K}$ respectively have the same dimensions. Their emissivities are in the ratio $16 : 1$. At $\text{T}_1 = x\text{T}_2$, they radiate the same amount of heat per unit area per unit time. The value of $x$ is

At any time \( t \), the co-ordinates of moving particle are \( x = at^2 \) and \( y = bt^2 \). The speed of the particle is

Two coherent waves of intensities \(I_1\) and \(I_2\) pass through a region at the same time in the same direction. The sum of maximum to minimum intensities is

If \(E\) is the amplitude of the electric field of the waves starting from the slits in a double slit experiment and \(\theta\) is the phase difference between the waves reaching a point on the screen, the ratio of the amplitude of the resultant electric field at that point on the screen to the amplitude at one of the slits is

The angle of a prism made of a material of refractive index \( \sqrt{2} \) is \( 90^\circ \). The angle of incidence for a light ray on the first face of the prism such that the light ray suffers total internal reflection at the second face is