Home
Class 12
PHYSICS
Answer the following questions: (c) Wh...

Answer the following questions:
(c) When a tiny circular obstacle is placed in the path of light from a distant source, a bright spot is seen at the centre of the shadow of the obstacle. Explain why?

Text Solution

Verified by Experts

Waves diffracted from the edge of the circular obstacle interfere constructively at the centre of the shadow producing a bright spot.
Promotional Banner

Similar Questions

Explore conceptually related problems

A narrow circular disc is placed in the path of beam of white light. The centre of the geometrical shadow will be :

Answer the following questions: (e) Ray optics is based on the assumption that light travels in a straight line. Diffraction effects (observed when light propagates through small apertures/slits or around small obstacles) disprove this assumption. Yet the ray optics assumption is so commonly used in understanding location and several other properties of images in optical instruments. What is the justification?

(a) When monochromatic light is incident on a surface separating two media, the reflected and refracted light both have the same frequency as the incident frequency. Explain why? (b) When light travels from a rarer to a denser medium, the speed decreases. Does the reduction in speed imply a reduction in the energy carried by the light wave? (c) In the wave picture of light, intensity of light is determined by the square of the amplitude of the wave. What determines the intensity of light in the photon picture of light

Answer the following questions on the basis of the diagram of a biogas plant gven below: (a) What is biomass? How is biogas obtained from biomass? (b) Why is biogas considered an ideal fuell ? "Biogas plant is a boon to farmers." Why? (c) Name the parts labelled A, B , and C in the diagram.