At a finite distance from the source, a point source of light produces

What is a point source of light?

Stars:Point source of light: : Planets :

In the figure shown, O is a point source of light and S is a screen placed at a distance L from the source. Intensity of light at point A on the screen due to the source is 81 I where I is some unit. Now a large mirror (M) is placed behind the source at a distance L from it. The mirror reflects 100% of the light energy incident on it. Calculate the inten- sity at point A. ,brgt

A point source of constant power P is emitting photon of wavelength lambda . What is the intensity of photons at r distance from the source ?(speed of light = c)

The "luminous flux" or perceived brightness, of a light source is measured in lumens and is inversely proportional to the square of the distance from the light. If a light source produce 200 lumens at a distance at a distance of 3 meters, at what distance will the light source produce a luminous flux of 25 lumens?

Assertion A spherical wave front is produced by a point source of light . Reason : It is because, the locus of al points, which are equidistant from the point source, is a sphere.

Two plane mirrors makes an angle of 120^(@) with each other. The distance between the two images of a point source formed in them is 20 cm . Determine the distance from the light source of the point where the mirrors touch, the light source lies on the bisector of the angle formed by the mirrors.

Two plane mirrors makes an angle of 120^(@) with each other. The distance between the two images of a point source formed in them is 20 cm . Determine the distance from the light source of the point where the mirrors touch, the light source lies on the bisector of the angle formed by the mirrors.

Two plane mirrors makes an angle of 120^(@) with each other. The distance between the two images of a point source formed in them is 20 cm . Determine the distance from the light source of the point where the mirrors touch, the light source lies on the bisector of the angle formed by the mirrors.

The wavefront originating from the point source of light at finite distance is