HSC Science (Electronics) १२ वीं कक्षा - Maharashtra State Board Important Questions

What are primary and secondary sources of light?

Why are multiple colours observed over a thin film of oil floating on water? Explain with the help of a diagram.

The optical path of a ray of light of a given wavelength travelling a distance of 3 cm in flint glass having refractive index 1.6 is the same as that on travelling a distance x cm through a medium having a refractive index 1.25. Determine the value of x. 

Describe Young's double-slit interference experiment and derive conditions for occurrence of dark and bright fringes on the screen. Define fringe width and derive a formula for it.

What are the conditions for obtaining a good interference pattern? Give reasons.

A double-slit arrangement produces interference fringes for sodium light (λ = 589 nm) that are 0.20° apart. What is the angular fringe separation if the entire arrangement is immersed in water (n = 1.33)?

State any four applications of beats.

Light of wavelength 5000 A.U. falls on a plane reflecting surface. The frequency of reflected light is ______ 

Light follows wave nature because ______ 

What is the shape of the wavefront on Earth for Sunlight?

In Young’s double-slit experiment, if there is no initial phase difference between the light from the two slits, a point on the screen corresponds to the 5th minimum. What is the path difference? 

Why two light sources must be of equal intensity to obtain a well-defined interference pattern?

What is the relation between phase difference and Optical path in terms of speed of light in a vacuum?

State any four Conditions for Obtaining well–defined and Steady Interference Patterns. 

Draw a neat labelled ray diagram of the Fresnel Biprism experiment showing the region of interference. 

Explain the reflection of light at a plane surface with the help of a neat ray diagram. 

Explain constructive and destructive interference with the help of a diagram?

Plane wavefront of Light of wavelength 6000 Å is incident on two slits on a screen perpendicular to the direction of light rays. If the total separation of 10 brights fringes on a screen 2m away is 2 cm, find the distance between the slits.

With the help of a neat diagram, explain the reflection of Light on a plane-reflecting surface.

Two tuning forks of frequencies 320 Hz and 340 Hz are sounded together to produce a sound wave. The velocity of sound in air is 326.4 m/s. Calculate the difference in wavelengths of these waves.