Question
When a tiny circular obstacle is placed in the path of light from a distant source, a bright spot is seen at the center of the shadow of the obstacle. Explain why.
✓
Answer
Waves diffracted from the edges of the circular obstacle interfere constructively at the centre of the shadow producing a bright spot.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
If coherent waves of light produce destructive interference, then what will be the phase difference between them?
Drift velocity is inversely proportional to what? and it does not depend on what?
Which part of electromagnetic spectrum is used in the working of radar?
A conducting loop is held below a current carrying wire PQ as shown. Predict the direction of the induced current in the loop when the current in the wire is constantly increasing.
What is the value of the electric field produced by charge $Q$ at any point $\vec{r}$ ?
→Kamla peddles a stationary bicycle. The pedals of the bicycle are attached to a 100 turn coil of area $0.10 m ^2$. The coil rotates at half a revolution per second and it is placed in a uniform magnetic field of $0.01 T$ perpendicular to the axis of rotation of the coil. What is the maximum voltage generated in the coil?
→Two persons pull a rope towards themselves. Each person exerts a force of $100N$ on the rope. Find the Young's modulus of the material of the rope if it extends in length by $1\ cm.$ Original length of the rope $= 2m$ and the area of cross$-$section $= 2\ cm^2.$
→A barometer tube reads 76cm of mercury. If the tube is gradually inclined keeping the open end immersed in the mercury reservoir, will the length of mercury column be 76cm, more than 76cm or less than 76cm?
If the ratio of the amplitudes of two waves is $a_1: a$, , then what will be the ratio of their intensities?
→How does the fringe width of interference fringes change, when the whole apparatus of Young’s experiment is kept in a liquid of refractive index 1.3?