A point light source of `100W` is placed at a distance x from the centre ofa hole ofradius R in a sheet as shown in figure, Find the power passing through the hole in sheet

A hemisphere of radius R, made of glass of refractive index (3/2) is placed on 'the table. A point source of light is placed at a distance 2R from the centre, of hemisphere. If source is viewed diametrically opposite side of hemisphere. Find the position of image of source.

A mono chromatic light source of wave length I is placed at a distance R from the mirror as shown and a spherical screen of radius R is at a distance R from the source as shown in the figure and point P is on the sphere nearest to the source.It R is two times the wave length (R=2l) then f'+(p)

If two coherent source are placed at a distance 3lambda from each other, symmetric to the centre of the circel as shown in figure, Find thenumber of fringes shown on the screen, placed along the circumference ?

Two slits are made on an opaque surface at a separation of 1 mm from each other. A screen is placed at a distance 1 m from the plane of the slits. A small hole is made on the screen at a distance 1 mm from the centre of the screen as shown in the figure. If we observe the light coming out from hole on the other side, then which wavelengths in the visible region will be absent and which will show strong presence ? Wavelength of visible light ranges from 400 nm to 700 nm.

A point mass m is released from rest at a distance of 3R from the centre of a thin-walled hollow sphere of radius R and mass M as shown. The hollow sphere is fixed in position and the only force on the point mass is the gravitational attraction of the hollow sphere. There is a very small hole in the hollow sphere through which the point mass falls as shown. The velocity of a point mass when it passes through point P at a distance R//2 from the centre of the sphere is

A point particle of mass m is released from a distance sqrt(3)R along the axis of a fixed ring of mass M and radius R as shown in figure. Find the speed of particle as it passes through the centre of the ring.

The figure shows a disc of radius 3R from which a circular hole of radius R is cut as shown in the figure. The distance of the centre of mass of the remaining object from the point O is

Find the position of centre of mass of the uniform planner sheet shown in figure with respect to the origin (O) -

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