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The following figure shows the positions...

The following figure shows the positions of a point object O, two lenses, a Plane mirror and the final image I which coincides with the object. The focal length of the convex lens is 20 cm. Calculate the focal length of the concave lens.

The distance between the first and the sixth bright fringes formed in Young's double slit experiment ( measured by a spectrometer ) is found to be 12.5 mm. The separation between the slits is 0.12 mm and the distance of the screen from the slits is 60 cm. Calculate :
The fringes width

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