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light strikes the grooves → different wavelengths of light bend at different angles → diffracted wavelengths reach the eyes → the eyes see different colors

Explanation:

As we know that the wavelength of light incident on the diffraction grating then the resultant on the screen is given at an angle given by

here a = size of grating

so here the when light incident on the grating then different wavelengths of light will give superposition at different angles and then it reaches to our eye.

So due to this superposition of light at different angles we will get the colors at different positions.

so correct order will be

light strikes the grooves → different wavelengths of light bend at different angles → diffracted wavelengths reach the eyes → the eyes see different colors