MHT CET 2026 20th April Morning Shift | Wave Optics Question 4 | Physics

Light of wavelength $580$ nm is incident normally on a slit of width '$a$'. The distance between slit and screen is $2.5$ m and the distance of the second order maximum from the centre of the screen is $14.5$ mm in a diffraction pattern. The value of '$a$' is

$0.12 \times 10^{-3}\,\text{m}$

$0.25 \times 10^{-3}\,\text{m}$

$0.36 \times 10^{-3}\,\text{m}$

$0.50 \times 10^{-3}\,\text{m}$

MHT CET 2026 20th April Morning Shift

MCQ (Single Correct Answer)

-0

In an interference experiment, the $m^{th}$ bright fringe for light of wavelength $\lambda_1$ coincides with the $n^{th}$ dark fringe for light of wavelength $\lambda_2$ . The ratio $\dfrac{\lambda_2}{\lambda_1}$ is

$\dfrac{m}{n-1}$

$\dfrac{m}{(2n-1)}$

$\dfrac{2m}{(2n-1)}$

$\dfrac{2m}{(2n+1)}$

MHT CET 2026 20th April Morning Shift

MCQ (Single Correct Answer)

-0

In a biprism experiment, the distance between $4^{th}$ and $13^{th}$ bright band on the same side is '$y$' when light of wavelength $6000$ Å is used. For a light of wavelength '$\lambda$' the distance between $6^{th}$ and $16^{th}$ bright band on the same side is again '$y$'. The value of '$\lambda$' in Å units is

$6500$

$6300$

$5400$

$4800$

MHT CET 2025 5th May Evening Shift

MCQ (Single Correct Answer)

-0

A beam of light of intensity $I_0$ falls on a system of three polaroids which are arranged in succession such that the pass (transmission) axis is turned through $60^{\circ}$ with respect to preceding one. The fraction of the incident light intensity that passes through the system is $\left(\cos 60^{\circ}=\frac{1}{2}\right)$

$\frac{1}{8}$

$\frac{1}{32}$

$\frac{1}{16}$

$\frac{1}{2}$

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