Assertion : Interference pattern is made by using blue light inst… - Vidyadip

Question

Assertion : Interference pattern is made by using blue light instead of red light, the fringes becomes narrower.
Reason : In Young's double slit experiment, fringe width is given by relation $B=\frac{\lambda D}{d}$.

✓

Answer

(a) $\beta=\frac{\lambda D}{d}$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "Assertion & Reason" from Wave Optics→Wave Optics — all question types→JEE physics STD 12 Science question papers→CBSE Board STD 12 Science question papers→CBSE Board question paper generator→

Similar questions

Assertion : The specific heat of a gas is an adiabatic process is zero and in an isothermal process is infinite.
Reason : Specific heat of a gas in directly proportional to change of heat in system and inversely proportional to change in temperature.

Assertion : Where two vibrating tuning forks having frequencies $256 \mathrm{~Hz}$ and $512 \mathrm{~Hz}$ are held near each other, beats cannot be heard.
Reason : The principle of superposition is valid only if the frequencies of the oscillators are nearly equal.

Assertion : If the frequency of alternating current in an ac circuit consisting of an inductance coil is increased then current gets decreased.
Reason : The current is inversely proportional to frequency of alternating current.

Assertion : Water at the foot of the water fall is always at different temperature from that at the top.
Reason : The potential energy of water at the top is converted into heat energy during falling.

Assertion : First law of thermodynamics is a restatement of the principle of conservation
Reason : Energy is fundamental quantity.

Assertion : A $P-N$ photodiode is made from a semiconductor for which $E=2.8 eV$. This photo diode will not detect the wavelength of $6000 nm$.
Reason : A $P N$ photodiode detect wavelength $\lambda$ if $\frac{h c}{\lambda}>E_g$.

Assertion : The equation of motion can be applied only if acceleration is along the direction of velocity and is constant.
Reason : If the acceleration of a body is constant then its motion is known as uniform motion.

Assertion : Sun is at the galactic centre $C$ of the milky way
Reason : All planets of solar system revolve around the sun.

Assertion : Machine parts are jammed in winter.
Reason : The viscosity of lubricant used in machine parts increase at low temperature.

Assertion : The radiation from the sun's surface varies as the fourth power of its absolute temperature.
Reason : The sun is not a black body.