Tag: light, shadows and images

Quizzes (6) Questions (62)

Questions Related to light, shadows and images

Multiple choice evs light, shadows and images what makes things visible nature and sources of light light travels in straight line

What is the wavelength range of visible light?

  1. $ 4 \times 10^{-7} m $ to $ 8 \times 10^{-7} m$
  2. $ 4 \times 10^{-9} m $ to $ 8 \times 10^{-9} m$
  3. $ 4 \times 10^{-5} m $ to $ 8 \times 10^{-5} m$
  4. $ 4 \times 10^{-6} m $ to $ 8 \times 10^{-6} m$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The wavelength of visible light lies between $400\,{\rm{nm}}$ to $800\,{\rm{nm}}$.

Or, $4 \times {10^{ - 7}}$ to $8 \times {10^{ - 7}}\,{\rm{m}}$

 

Multiple choice evs light, shadows and images what makes things visible nature and sources of light light travels in straight line

In a YDSE with two identical slits, when the upper slit is covered with a thin, perfectly transparent sheet of mica, the intensity at the centre of screen reduces to $75\%$ of the initial value. Second minima is observed to be above this point and third maxima below it. Which of the following can be a possible value of phase difference caused by the mica sheet.

  1. $\dfrac{\pi}{3}$
  2. $\dfrac{13\pi}{3}$
  3. $\dfrac{17\pi}{3}$
  4. $\dfrac{11\pi}{3}$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Here when second order minica replaces bright spot change in path difference$3\pi $


Second order minica phase difference$\dfrac { \pi  }{ 2 } $

Phase difference lies between $3\pi\ to\ 4\pi $ i.e. $\dfrac{11\pi}{3}$