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  4. If a thin film of thickness t and refractive index μ is placed in the path of light coming from a source S, then increase in length of optical path is :

Q. If a thin film of thickness $t$ and refractive index $\mu$ is placed in the path of light coming from a source $S$, then increase in length of optical path is :

Wave Optics Report Error

Solution:

Increase in optical path is given as
$\Delta=\mu t-t=(\mu-1) t $

Questions from Wave Optics

1. Light from a source emitting two wavelengths $\lambda_1$ and $\lambda_2$ is allowed to fall on young’s double-slit apparatus after filtering one of the wavelengths. The position of interference maxima is noted. When the filter is removed both the wavelengths are incident and it is found that maximum intensity is produced where the fourth maxima occurred previously. If the other wavelength is filtered, at the same location the third maxima is found. Find the ratio of wavelengths.

2. Which of the following phenomena support the wave theory of light ?
(a) scattering
(b) interference
(c) diffraction
(d) velocity of light in a denser medium is less than the velocity of light in the rarer medium

KCET 2013

3. In Young's double slit experiment, how many maxima can be obtained on a screen (including central maxima), if $\text{d} = \frac{5 \lambda }{2}$ (where $\lambda $ is the wavelength of light)?

NTA Abhyas 2020

4. Light of wavelength $600 \, nm$ is incident normally on a slit of width $0.2 \, mm$ . The angular width of central maxima in the diffraction pattern is (measured from minimum to minimum)

NTA Abhyas 2020

5. Using monochromatic light of wavelength $\lambda$, an experimentalist sets up the Young's double slit experiment in three ways as shown.
If she observes that y = $\beta'$ the wavelength of light used is :
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JEE Main 2014

6. At two points P and Q on a screen in Young's double slit experiment, waves from slits $S_1$ and $S_2$ have a path difference of 0 and $\frac{\lambda}{4}$ respectively. The ratio of intensities at P and Q will be :

AIEEE 2011

7. Interference fringes are being produced on screen $X Y$ by the slits $S_{1}$ and $S_{2} .$ In figure, the correct fringe locus is

8. Two waves having the intensities in the ratio $9: 1$ produce interference. The ratio of maximum to minimum intensity is equal to

9. Assertion Corpuscular theory fails in explaining the velocities of light in air and water.
Reason According to corpuscular theory, light should travel faster in denser media than in rarer media.

10. In a Young's double slit experiment, first maxima is observed at a fixed point $P$ on the screen. Now the screen is continuously moved away from the plane of slits. The ratio of intensity at point $P$ to the intensity at point $O$ (centre of the screen)

Physics Most Viewed Questions

1. A car starts from rest and accelerates at $5\, m / s ^{2}$ At $t=4\, s$, a ball is dropped out of a window by a person sitting in the car. What is the velocity and acceleration of the ball at $t =6\, s$ ? (Take $\left. g =10\, m / s ^{2}\right)$

NEET 2021

2. An inductor of inductance $L$, a capacitor of capacitance $C$ and a resistor of resistance ' $R$ ' are connected in series to an ac source of potential difference ' $V$ ' volts as shown in figure. Potential difference across $L , C$ and $R$ is $40 V$, $10\, V$ and $40 V$, respectively. The amplitude of current flowing through LCR series circuit is $10 \sqrt{2} A$. The impedance of the circuit is :

NEET 2021

3. The escape velocity from the Earth's surface is $v$. The escape velocity from the surface of another planet having a radius, four times that of Earth and same mass density is :

NEET 2021

4. A dipole is placed in an electric field as shown. In which direction will it move ?

NEET 2021

5. If $E$ and $G$ respectively denote energy and gravitational constant, then $\frac{ E }{ G }$ has the dimensions of:

NEET 2021

6. A capacitor of capacitance $'C'$, is connected across an ac source of voltage $V$, given by $V = V _{0} \sin \omega t$
The displacement current between the plates of the capacitor, would then be given by:

NEET 2021

7. The half-life of a radioactive nuclide is $100$ hours. The fraction of original activity that will remain after $150$ hours would be :

NEET 2021

8. A person sitting in the ground floor of a building notices through the window, of height $1.5\, m$, a ball dropped from the roof of the building crosses the window in $0.1\, s$. What is the velocity of the ball when it is at the topmost point of the window ? $(g = 10 \,m/s^{2})$

NEET 2020

9. For a plane electromagnetic wave propagating in $x$-direction, which one of the following combination gives the correct possible directions for electric field (E) and magnetic field (B) respectively?

NEET 2021

10. Time intervals measured by a clock give the following readings :
$1.25\, s, 1.24 \,s, 1.27 \,s, 1.21 \,s$ and $1.28\, s$
What is the percentage relative error of the observations ?

NEET 2020

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