`M_(1)` and `M_(2)` are plane mirrors and kept parallel to each other. At point O, there will be a maxima for wavelength `lambda`. Light from a monochromatic sources S of wavelength `lambda` is not reaching directly on the screen. Then, `lambda` is

M_(1) and M_(2) are two plane mirrors which are kept parallel to each other as shown. There is a point 'O' on perpendicular screen just infront of 'S' . What should be the wavelength of light coming from monchromatic source 'S' . So that a maxima is formed at 'O' due to interference of reflected light from both the mirrors. [Consider only 1st reflection]. [D gt gt d, d gt gt lambda]

M_(1) and M_(2) are two plane mirrors which are kept parallel to each other as shown. There is a point 'O' on perpendicular screen just infront of 'S' . What should be the wavelength of light coming from monchromatic source 'S' . So that a maxima is formed at 'O' due to interference of reflected light from both the mirrors. [Consider only 1st reflection]. [D gt gt d, d gt gt lambda]

In Fraunhofer diffraction experiment, the first minima of red light (lambda = 600 nm ) if formed on the first maxima of another light of wavelength lambda' . Find the value of lambda' .

In Fraundhofer diffraction experiment the first minima of red light (lambda=660mm) is formed on the first maxima of another light of wavelength lambda . Find the value of lambda .

When a metal is illuminated by light of wavelength lambda , the stopping potential is V_@ and for wavelength 2lambda , it is 3V_@ .Then the threshold wavelength is ?

Two mirror M_(1) and M_(2) make an angle phi with line AB . A point source S is kept at a distance r from the point of intersection of mirror. A small hemispherical annular mask is kept close to S so that no ray emanting from S directly reaches the screen kept at a distance b from the source. Interference pattern of rays reflected from M_(1) and M_(2) is oberved on the screen. Find the fringe width of this interference pattern lambda= wavelength of light being emitted by source.

Two mirror M_(1) and M_(2) make an angle phi with line AB . A point source S is kept at a distance r from the point of intersection of mirror. A small hemispherical annular mask is kept close to S so that no ray emanting from S directly reaches the screen kept at a distance b from the source. Interference pattern of rays reflected from M_(1) and M_(2) is oberved on the screen. Find the fringe width of this interference pattern lambda= wavelength of light being emitted by source.